iSpring RCC7AK RO System [Alkaline Remineralization]

The iSpring RCC7AK is an upgraded version of the RCC7 model with the addition of a nice extra filter. It can filter out all types of contaminants and enrich the water in the same process giving you a healthier, natural-tasting, clean drinking water.

Excellent Filtration Process

The RCC7AK features multi-layered filtration process designed around 6 very efficient filtration stages specially tailored to progressively remove all types of contaminants and improve the water quality.

The first three stages are pre-filters consisting of polypropylene sediment filter in the 1st stage, GAC filter in the 2nd stage and a carbon block filter in the 3rd stage.

These three filters trap all the sediments and particles that are larger than 5 microns and more importantly removes chlorine, chloramines and other chemicals present in the water.

The fourth stage where the magic happens sits a quality RO membrane which eliminates all the remaining contaminants down to 0.0001 microns leaving behind only pure water.

A fine GAC filter takes the fifth stage and where the water from the RO tank is further polished to remove any residual contaminants from the tank.

Restoration of Lost Minerals

After going through the initial 5-stage RO filtration process, the RCC7AK includes a 6th stage which consists of an alkaline remineralization filter.

The standard 5 stages produce clean, pure water with all the contaminants removed as well as the few helpful minerals present in the water.

This 6th stage is a big plus as the alkaline filter restores the healthy minerals lost due to the RO process. The AK filter features red mineral stones which add back calcium and other essential minerals such as magnesium and potassium.

The filter also has a calcite portion that helps raise the pH levels of the RO water hence creating a much natural alkaline balance in the water.

Therefore, you not only get the benefit of drinking clean, purified water but you are also assured of getting some healthy minerals as well and a better, more natural taste.

RO water is so pure and as such it often tastes unnatural, but with this alkaline filter in place, your water will certainly taste much better.

Furthermore, the filter is made up of only natural mineral stones that serve as the filtration media hence your body will have no problem absorbing the restored minerals directly.

Filtration Capacity

The filtration capacity of RO membrane of this iSpring RCC7AK model is also quite decent for an under-sink residential RO system.

It’s capable of producing up to 75 gallons of filtered water a day which is sufficient to handle the water needs of small to medium-sized families whether it’s drinking or cooking.

Moreover, the system is relatively efficient as for each gallon of pure water produced, it wastes only 2 gallons which is really a mean feat for most filtration systems.

Installation and Maintenance

Featuring quick fittings, a cabinet fitted bracket and a clear, well-organized manual and videos, installing the RCC7AK is quite easy, especially if you have some little DIY skills.

All the parts you need including the pressurized tank, faucet, drain saddle, feed water adapter, tank valve and tubings are provided alongside the filters, membrane and the RO frame itself.

The system will easily fit under any standard kitchen sink and the overall construction is quite solid. The filters are durable too with the first three pre-filters requiring replacing just twice a year and the two post-filters requiring changing once a year.

The membrane will last 2 to 3 years based on the quality of your source water. Noise won’t also be a major problem like in other systems. The unit runs smoothly producing the least sound possible. 

All in all, the iSpring RCC7AK is a well-designed RO system with an effective 6-stage filtration process that eliminates all kinds of contaminants from the water and replenishes it with essential, natural minerals.

It’s definitely a win-win investment for anyone looking for an affordable system that can deliver a more natural tasting and healthier filtered water.


  • Efficient filtration process ensures crisp, clean, drinking water
  • Restores healthy minerals to the water and improves its pH balance
  • Decent filtration capacity and pure to wastewater ratio
  • Durable stainless steel construction 
  • Easy installation with a convenient noise-free operation
  • Backed by one year warranty plus a one-year money-back guarantee


  • That automatic shut off valve seems a bit flimsy
  • May need some DIY skills for easy installation

Read moreiSpring RCC7AK RO System [Alkaline Remineralization]

iSpring RCC7AK-UV 7-Stage Reverse Osmosis System

The iSpring RCC7AK-UV is yet another top-notch model within the iSpring RCC7 series. It’s the variation of the iSpring RCC7AK model offering the same great RO system that features a remineralization filter but with the addition of a UV light filter. 

iSpring RCC7AK-UV is a deluxe multi-layered reverse osmosis system that provides optimal protection against more than 1,000 different types of contaminants including arsenic, asbestos, chlorine, hormones, fluoride, lead, mercury, sodium, bacteria, giardia, viruses and more.

The RO system consists of 7 processing stages, the first 6 stages work similarly to the previous system RCC7AK, the 7th stage is an 11W UV bulb as an additional protection layer that against the variety of microorganism that past the RO filter.

Filtration Process

The RCC7AK-UV comes equipped with 7 filtration stages which makes it one of the most comprehensive RO systems from iSpring and one that guarantees the best water quality possible.

The initial 5 stages consist of the standard iSpring’s 3 pre-filters we’ve seen in the other models and they remove all large contaminants down to 5 microns and chemicals particularly chlorine and chloramines.

They are followed by the 0.0001-micron RO membrane that removes up to 99% of all the remaining contaminants. The fifth stage is a finer GAC filter which gives the RO water the final polishing as it leaves the RO tank.

After passing through these initial 5 stages, the RCC7AK-UV model incorporates two more stages comprising of an alkaline remineralization filter and a UV sterilization filter.

Sixth Stage – Alkaline Filter

The 6th stage of the RCC7AK-UV uses an alkaline remineralization filter which is made up of red mineral stones that restore the healthy minerals removed from the RO water by the initial 5 stages. It adds back calcium, magnesium, potassium, and sodium.

The filter also has a calcite portion which helps raise the pH level of the RO water to natural alkaline balance giving a better and more natural taste. This is essential as the RO filtration process reduces the pH value of the water making it tastes slightly acidic.

Seventh Stage – UV Sterilization Filter

The final stage in this RCC7AK-UV system features a UV sterilization filter that offers an additional level of protection from possible microorganism contamination.

The filter uses a powerful 11W UV lamp which emits UV light as the water passes through it. The UV light kills 99.99% of harmful organic microorganisms that might seep past the RO filters including bacteria, protozoan cysts and viruses.

To ensure great efficiency, the unit comes with a smart flow sensor switch too which turns off the UV light once the water is not flowing through it thereby saving power. The UV lamp also comes in a protective stainless steel housing to ensure its durability.

Filtration Capacity

The RO membrane of the RCC7AK-UV can deliver a maximum of 75 gallons per day. The capacity might vary though based on your source water pressure and temperature but it’s able to meet the needs of most small to medium-sized families.

The system, however, wastes around 3 gallons of water for every one gallon of clean water it produces. Considering that most of the other iSpring’s model has an average ratio of 2:1, this one will slightly waste more water unless you install a booster pump alongside it.

Installation and Maintenance

As with the other iSpring models in our list, the RCC7AK is not that hard to install yourself if you have basic DIY skills. Everything you need to set it up is provided and the instruction manual is user-friendly with pictures and illustrations that make it easier to understand and follow. The whole unit is compact and will nicely fit under any standard kitchen sink.

Overall, the quality, performance, and features of this RO system are really commendable. By combining both the alkaline and the UV lamp filter means you are always assured of clean, healthy water that has a much better and natural taste throughout.

It’s a system we would highly recommend for anyone wanting a unit that offers more than just the standard RO filtration process.


  • Removes more than 1000 different contaminants
  • Alkaline filter restores healthy minerals and raises pH
  • UV filter to help kill harmful microorganisms in the water
  • Flow sensor switch helps keeps power cost low
  • Up to 75 gallons of clean water output per day
  • Relatively easy to install and operates quietly
  • Comes with a 3-year limited warranty plus a 1-year money-back guarantee


  • Wastes 3 gallons of water per 1 gallon of clean water which slightly above average
  • Low source water pressure may affect production capacity and speed

Read moreiSpring RCC7AK-UV 7-Stage Reverse Osmosis System

iSpring RCC7 Reverse Osmosis System Review

Our first top pick is the iSpring RCC7 RO system. This is one of the best-selling RO products from iSpring.

iSpring RCC7 reverse osmosis system is unequaled in performance, quality, and durability. This RO system has a 5-stage filtration that removes over 1000+ different kinds of contaminants and it features 75 GPD.

It’s simple and affordable but a very reliable and efficient system that’s more than capable of removing all kinds of contaminants in the water.

Filtration Process and Stages

The RCC7 features an effective 5-stage RO filtration process which does so well to produce very clean and pure final water that’s safer and healthier to drink.

The first batch of filters in the system are three carbon-based pre-filters that make up the first three stages.

The first stage is the sediment filter which is a high capacity polypropylene filter that removes all sediments and silt in the water down to 5 microns.

The second stage is made up of a 5-micron granular activated carbon (GAC) filter which is quite effective at trapping large contaminants and chemicals like chlorine and chloramines as well as removing microorganisms present in water.

All the particles, microorganisms and chlorine that leaked through the second stage GAC filter are trapped by the CTO carbon filter in the third stage.

These three pre-filters are amongst the best you will find in the market. They perform so well with regards to eliminating most of the contaminants, chemicals, and microorganisms present in the water which allows the RO membrane to function at its maximum efficiency.

The membrane itself it’s a thin film composite filter that makes up the fourth stage of this iSpring’s RCC7 filtration system.

It’s very capable of removing contaminants down to 0.0001 microns which is so small to allow only water molecules to squeeze through while stopping up to 99.99% of up to 1,000 different contaminants.

Virtually nothing else will be able to pass through. It will completely remove all the harmful contaminants that often appear in well and municipal water including chlorine, dissolved solids, arsenic, bacteria, and viruses.

The final stage consists of a fine GAC post-filter which does the final polishing of the water by removing any other TDS or contaminants in the water from the RO tank before it’s delivered to the faucet.

The five stages of the systems progressively remove contaminants, cleaning and purifying the water to improve its quality and taste. 

Filtration Capacity

The membrane of the RCC7 also has a high throughput which big thumps up. It’s capable of delivering up to 75 gallons of purified water every day which is sufficient capacity for nearly any family size even large families.

For every gallon of purified water produced, the system wastes around 3 gallons although it may vary depending on the quality and pressure and of your feed water. However, this average ratio you will find in most standard RO systems.

Installation and Maintenance

The system comes with quick-fitting connectors and everything that you need including all the parts from the storage tank to the faucet as well as all the mounting hardware and clear, well-organised instructions.

So, installation is pretty much straightforward if you are a very handy person or have some basic DIY skills. The system requires very little maintenance too as there are no moving parts.

The pre-filters have a service life of 6 months before requiring replacement while the post-carbon filter needs to be replaced every year. The membrane, on the other hand, will go for up to 2 to 3 years before requiring replacement.

Furthermore, the first stage filter (sediment filter) has a clear-see through housing which facilitates an easy way to inspect the condition of the filter and know when it’s time to change it before a problem occurs.

The only setback we noted about this system is that the O-rings are somewhat thin and look a bit flimsy. Even so, it’s not really a deal-breaker as it can last long enough before you can change it for much better quality.

All the other components and parts are of great quality. The tank is made of steel and the construction of the main RO unit is sturdy which makes it very durable. You will also not hear any sound as the system is in operation. It’s super quiet.


  • An effective 5-stage filtration process
  • Removes up to 99.99% of all contaminants
  • Can deliver 75 gallons of pure water per day
  • Has quick-connect fittings for easy DIY installation
  • See-through first stage filter housing for easy inspection
  • The filters and membrane have a decent service life
  • Comes with a 1-year warranty and lifetime support


  • O-ring is quite thin and somewhat flimsy
  • The wastewater ratio is relatively high

Read moreiSpring RCC7 Reverse Osmosis System Review

iSpring RCC7P 5-Stage Reverse Osmosis System Review

iSpring RCC7P reverse osmosis system is an extended version of the RCC7 with an electric booster pump that ensures reliable, consistent performance regardless of pressure variations. This RO system is ideal for low-pressure water, the booster pump allows the system to achieve tank fill up to 50% faster and 50% less water waste.

If you live in an area where your typical residential water pressure is low, say around 40psi or lower, then this iSpring RCC7P might just be the ideal choice for you.

It’s a high-performance system designed with an inbuilt pump that boosts the feed water pressure high enough to allow the system to perform much effectively.

Filtration Process

Like the RCC7 model, the iSpring RCC7P utilizes a 5-stage RO filtration process which ensures reliable and efficient water purification results.

The three first stages consist of three 5-micron pre-filters that include a polypropylene sediment filter followed by a carbon KDF (GAC) filter and then a carbon block (CTO) filter.

The first two filters trap all sediments, large contaminants, and microorganisms that are bigger than 5 microns including chlorine, chloramines and other chemicals.

Smaller contaminants, chlorine, and microorganisms that pass through the second stage are further removed by the carbon block filter in the third stage.

The fourth stage is a high rejection RO membrane which gets rids of all remaining contaminants that are as small as 0.0001 microns.

It has a rejection rate of 99.99% hence can eliminate more than a thousand harmful pollutants including arsenic, viruses, bacteria, chemicals, lead, pesticides, chlorine, and fluoride.

The final stage is the fine GAC filter that provides the final polishing. It removes any possible residual contaminant and odor that may have accumulated in the RO tank delivering clean and safe purified water to the faucet.

Inbuilt Booster Pump

Now the most commendable thing about this iSpring RCC7P model and what makes it really perform so well is the fact that it’s equipped with an inbuilt booster pump.

The RO filtration process requires high feed pressure so as to force all the impurities out of your water and when it’s low, the system will not be efficient. This is where this booster pump comes into play.

It’s designed to raise the inlet/feed water pressure going into the system from as low as 30 psi to about 70 to 80 psi which is an ideal level that optimizes the performance of the system from the first stage to the final one thereby facilitating more efficient filtering.

Furthermore, the pump features multiple sensors which help keep track of the pressure and turn on the pump as soon as the source water pressure falls below around 40 psi.

The sensors also automatically turn off the pump when the ideal pressure is obtained hence preventing any chances of overheating or other potential damages. Therefore, you are assured of consistent performance regardless of pressure variations.

Filtration Capacity

The RCC7P like its counterpart above utilizes a high capacity RO membrane that’s capable of producing 75 gallons of water per day which is large enough to handle the needs of most medium to large families.

Moreover, the booster pump helps increase the water production speed of the system allowing it to achieve almost 50% faster tank fill rate compared to its competitors.

Boosting the water pressure also has the effect of minimizing wastewater production as the pump forces more water through the filters there reducing the wastewater production to up to 50% which is quite commendable.

Installation and Maintenance

In terms of installation, the unit is designed for DIY installation with color-coded tubings and a push to connect fittings. It’s a pretty simple process that may not require the assistance of a professional if you some little technical skills.

The user manual is clear and well-written, and all the necessary parts and tools required for installation are included plus a video should you need visual instructions.

You will need to change the pre-filters after every 6 months while the post-carbon filter can last up to a year before needing to be replaced and the RO membrane can go for at least 2 years.

Both the pump and the system are quiet during operation hence you can expect no disturbance at all. They produce very little noise which you can hardly hear over normal kitchen activity.

In general, there’s no notable setback in this iSpring RO system that can cause any alarm. It’s a reliable unit that will deliver great performance especially in situations where the feed water pressure is below 40 psi. All the parts are of good quality and certified by FDA and WQA.


  • Optimum RO filtration performance through 5 stages
  • Booster pump effectively raises water pressure to ideal levels
  • Has a high pure water production rate with fairly less wastewater
  • Easy to install with all the necessary tools included
  • Both the pump and RO unit operate quietly
  • Ideal for use in areas with a feed water pressure of less 40psi
  • Backed by a 1-year warranty with lifetime support


  • The supply water valve and O-rings are not of the best quality
  • Requires a power source which may limit your installation options

Read moreiSpring RCC7P 5-Stage Reverse Osmosis System Review

iSpring RCB3P Reverse Osmosis System Review [Commercial Grade]

iSpring RCB3P reverse osmosis system combines three high-efficiency 100gpd RO membranes with a booster pump that produces up to 300 gallons of filtered water per day (300GPD). This is a great choice for commercial applications.

The iSpring RCB3P is amongst the top commercial-grade RO systems on the market. This flexible and convenient system is specifically designed for producing the purest water at high capacity making it a perfect model for commercial applications like in restaurants, labs, and industrial or hospital settings.

Filtration Process

The iSpring RCB3P uses a 5-stage filtration process that effectively removes all kinds of contaminants and impurities from your water supply. Stage one is a polypropylene sediment filter which traps all particle larger than 5 microns.

Stage two consists of a granular activated carbon (GAC) filter while in stage three there’s an activated carbon block filter. These two help remove chlorine, chloramine, cloudiness, odors, VOCs and other chemicals hence improving the taste of the water.

Stage four is made up of a triple membrane design consisting of three highly efficient RO membranes.

This unique combination of top quality RO membranes ensures optimal performance in removing all kinds of contaminants in the water from heavy metals, viruses, bacteria, toxins, hardness, and a long list of many other impurities.

The fifth stage is a carbon post-filter and this eliminates any residual tastes, odors, and contaminants from the RO tank.

Now the best part about this unit is that while most other systems feature standard 10” filters, this one uses oversized 20” pre-filters.

They remove twice as many contaminants as the standard filters with the same amount of water. This makes the system highly effective and ideal for heavy use in commercial environments without having to replace the filters frequently.

Filtration Capacity

As we mentioned earlier, the RCB3P is equipped with three high-efficiency membranes each producing 100 gallons of purified water per day. Together they give you up to 300 gallons of water per day which makes it a really great option for commercial applications.

300 gallons is a large amount of clean filtered water and it will cater to most large demand needs. It’s perfect for restaurants, small offices, labs, and even salons.

However, it doesn’t come with an RO storage tank which it will require for it to work efficiently. It will need a large pressurized storage tank but it’s compatible with most of the options available on the market, so it’s not something to worry about much.

The system comes with a booster pump which not only increases the feed water pressure to optimal levels but also boosts the production of purified water. It’s capable of raising the pressure up to 80 psi while it can work with feed water pressures as low as 25 psi.

By increasing the pressure to optimal levels, the booster pump also maximizes the efficiency of the membranes hence resulting in a fairly decent pure to drain water ratio.

For every gallon of water produced, the unit will discharge two gallons of wastewater which is a pretty fair ratio compared to most other commercial-grade systems out there.

Installation and Maintenance

The installation of the RCB3P won’t present much challenge as the system comes with all the tools necessary to set it up including the first set of filters.

The only thing you will need is the pressurized RO storage tank and the delivery pump for the output line as the system doesn’t provide adequate pressure.

It comes with a free-standing frame which allows you to set it virtually anywhere you want. It keeps everything nice and clean.

The downside though is that it will take a little more space than other standard RO systems. It’s a heavy-duty system made for commercial settings.

As for maintenance, there’s very little to worry about. The system is designed to automatically flush the membranes every now and then, so no back-washing or manual flushing is required.

The filters and the three membranes last more the ones you will find in standard RO systems as they are oversized 20” filters. The system is all equipped with a pressure gauge to help you quickly monitor the pressure changes and know when the filters need changing.

If you are after the best RO system for commercial use whether it’s in a restaurant, office, lab or salon, the iSpring RCB3P is certainly a perfect choice. It’s capable of producing a large amount of filtered water at a faster rate and the filters are highly durable.


  • Completely removes all contaminants in the water
  • High filtration capacity of up to 300 gallons per day
  • It’s equipped with a booster pump which increases its efficiency
  • A free-standing frame provides great portability and flexibility
  • Sturdily build with oversized filters for commercial use
  • Easy to install and maintain


  • Requires an RO storage tank which is not included More space is needed for the installation

Read moreiSpring RCB3P Reverse Osmosis System Review [Commercial Grade]

iSpring RCC1UP Reverse Osmosis System Review

Following the RCC7U is the iSpring RCC1UP which is an upgrade to the RCC7U model with the addition of a booster pump. It’s a unit that guarantees maximum performance and great filtration results in situations where the pressure of the source water is quite low.

Filtration Process

The RCC1UP utilizes a 6-stage RO filtration process same as the RCC7U. The first three pre-filters comprises of a sediment filter, a carbon KDF (GAC) filter and a carbon block (CTO) filter.

These filters effectively eliminate all large contaminants as well as chlorine, chloramines and other chemicals in the water. The RO membrane, on the other hand, performs a thorough filtration removing up to 99% of the remaining contaminants down to 0.0001 microns.

The fine GAC filter in the 5th stage takes care of residual contaminants from the RO tank while the 6th stage UV sterilizer which consists of powerful 11 watt UV lamp destroys all the bacteria, viruses and other microorganisms that may have made it past the RO filter. 

This highly effective filtration process ensures the water delivered on the RO faucet is totally free of contaminants and very safe to drink and cooking.

The unit is also equipped with a flow sensor switch that automatically controls the turning on and off of the UV light according to the water flow hence saving power.

Pre-installed Booster Pump

Besides featuring a UV light filter, the RCC1UP has a pre-installed booster pump which is an essential addition that allows the system to work efficiently even when the source water pressure below 40 psi.

The pump can raise the pressure of the feed water from as low as 30 psi to around 80 psi which is an optimal pressure level that enhances the performance of the unit and its production speed too.

Therefore, unlike its predecessor the RCC7U, this unit will give you faster tank fill rates even with fluctuations in your source water pressure.

Filtration Capacity

Another area we liked about this iSpring model is its high capacity RO membrane which can output up to 100 gallons of water per day.

This is much higher capacity than most of the other standard residential RO systems from iSpring on our list. It’s sufficient output that can suit well families of almost any size.

Furthermore, with the pump boosting the production speed, you can expect a steady flow of clean water all day long. The pump also reduces the wastewater from 3 gallons to about 2 gallons for every gallon of purified water produced which is way much better.

Installation and Maintenance

We found the RCC1UP relatively easy to set up as it uses push to connect fittings and comes with a clear manual and all the parts you need to install it.

It might be a little tricky though if you are not that good with DIY installations as it will require a power source and a bit more space because it’s somewhat bulky. However, it will fit in most under-sink kitchen cabinets provided is higher than 20”.

The filter cartridges in the first 3 stages require replacing every 3 to 6 months based on your water quality while the stage 5 filter is to be replaced every year. The UV light filter can last about a year.

The RO membrane requires the least maintenance since it can last 2 to 2 years before requiring replacement.

The best part is that despite having the boost pump, the system runs quietly, only producing a low volume hum which is hard to hear with normal kitchen activity.

The overall quality of the unit is good too. The prefilters feature thick and solid housings while the fittings are plastic but feel durable. It’s a system that will definitely serve you for many years.

Aside from the installation being slightly tricky, the RCC1UP is a powerful and reliable RO system that’s designed to get the job done right.


  • Removes all kinds of impurities
  • UV sterilizer help kill any microorganism in the water
  • Has pre-installed booster pump to enhance performance
  • A very high output ideal for medium to large families
  • Doesn’t waste a lot of water
  • Generates very low noise during operation
  • Backed by one-year limited warranty with a one-year money-back guarantee


  • Somewhat bulky requires a little more space to install
  • Installation might be slightly difficult

Read moreiSpring RCC1UP Reverse Osmosis System Review

iSpring RCS5T Reverse Osmosis System Review [500 GPD]

iSpring RCS5T reverse osmosis system is a high capacity tankless commercial grade reverse osmosis system. The RO system’s patented dual-flow membrane produces a rate of 500 gallons per day of RO filtered water with 1:1 waste to a pure water ratio.

iSpring RCS5T is designed purposely for those looking for a system that can supply purified drinking water on demand.

It’s a high-capacity tankless RO water filter system with an on-demand output ability which makes it a great choice for large families, small restaurants, coffee shops, and offices. 

Filtration Process

The RCS5T offers 5 stages of filtration with the first stage being a polypropylene sediment filter which removes debris down to 5 microns. It has a see-through housing that allows you to easily see if it’s blocked and requires replacement.

The next cartridge is a granular activated carbon (GAC) filter which traps chlorine particles, chloramines, and other pollutants like phenol and mineral oils.

The third stage consists of a carbon block filter which further removes all residual chlorine, tastes, odors as well as chloramines and microorganisms.

The fourth stage is one high-quality dual-flow RO membrane that removes contaminants down to 0.0001 microns which virtually eliminates 99% of all contaminants and pollutants common in the city or well water.

The last stage in the system is the post-carbon filter which takes care of any residual chlorine, chemicals or taste impurities and odors from the RO tank.

Tankless Operation

While it has a very effective RO filtration process, what makes this iSpring RCS5T system stand out is that it’s equipped with dual-flow membrane and booster pump, a combination which allows it to produce purified water on demand without requiring a storage tank.

This ability to work without the need for a tank makes the RCS5T an ideal choice for small commercial purposes as well as for households as it’s a great space-saving option.

In addition, the pre-installed booster pump does well to raise the water pressure going into the RO system which helps boost its performance and production rate.

The system can work with feed water pressure that’s as low as 25 psi and a maximum psi of 95 to 100, so it will work efficiently and effectively despite the pressure of the source water.

If your feed water pressure is quite low, you will find this booster pump to be a very useful addition plus there’s a nice built-in pressure gauge to allow you easily monitor the pressure.

Filtration Capacity

With a capacity to produce 500 gallons of filtered water per day (500 GPD) under ideal conditions, this iSpring RCS5T model is more than capable of meeting the daily demands of most large households and small offices with around 10 to 20 people.

The capacity is large enough to allow you even use the system for small commercial purposes like in a small restaurant, coffee shop or store and you will hardly notice any minor variations in the water production.

The best part is that you can pair the system with a pressurized storage tank if you desire to have reserve capacity for a steady and continuous supply.

A storage tank will be essential in case of very high usage situations, especially for commercial applications. You will need a delivery pump too as the output pressure of the clean water is about 10 to 15 psi on average.

Besides the high capacity, another major highlight of this iSpring RO system is the fact that it offers one of the most balanced pure water to wastewater ratio.

The dual-flow membrane ensures consistent output flow with a 1:1 pure to wastewater ratio which is pretty exceptional for such a high capacity system.

It will produce much less wastewater compared to other similar systems on the market that often have a pure to wastewater ratio of 1:3.

Installation and Maintenance

Installing the RCS5T is a breeze. Like the other iSpring’s systems above, this one is also designed for DIY installation and it comes complete with everything you need to set it up including a free-standing metal frame.

The installation manual is easy to understand and categorically explains every step accompanied by pictures in addition to the direct instructions.

Maintaining the unit is also simple. In fact, the system is designed to flush automatically to ensure the membrane is clean and works efficiently. No need to manually flush it.

All it’s required of you is changing the filter cartridges which is every 6 to 12 months for the carbon filters depending on usage and 2 to 3 years for the membrane. Furthermore, the booster pump produces very minimal noise thereby it won’t cause any disturbances.

The only setback is that it requires a power source for the booster pump which somewhat limits your installation options. Moreover, due to the large capacity, the power levels might be somewhat high, but that’s a tradeoff considering that it delivers a lot of purified water.

Generally, if you own a small restaurant, business or need a reliable tankless RO system for large residential use, then this iSpring RCS5T is a perfect choice. It will certainly not disappoint.


  • Removes up to 99% of contaminants in water
  • High capacity membrane delivers up to 500 GPD
  • Very efficient with 1:1 pure to wastewater ratio
  • Has a booster pump to ensure an optimum feed water pressure
  • Comes with an integrated pressure gauge
  • Installation is very simple and the pump operates quietly
  • Has a 1-year warranty


  • The booster pump may limit your installation options
  • Can lead to high power costs

Read moreiSpring RCS5T Reverse Osmosis System Review [500 GPD]

iSpring RCC7U Reverse Osmosis System [UV Sterilizer]

iSpring RCC7U reverse osmosis system with its advanced 11 watt UV sterilization stage is the perfect solution to purifying well water and other water sources containing excessive microorganisms. The unique water flows sensor switch turns the UV unit on and off automatically.

The iSpring RCC7U is one of the best RO systems on the market that provides a nice combination of standard RO process and an Ultraviolet (UV) sterilizer to deliver an extra level of protection that guarantees a much safer and cleaner water.

Filtration Process

To start, the RCC7U is based on the iSpring RCC7 model. The filtration process is composed of the standard 5 stages of the RCC7 with the addition of a UV light filter which makes it a 6-stage RO system.

In the first line of defense, we have the three-carbon prefilters which eliminate sediments, particles and contaminants larger than 5 microns. They also remove chlorine, chloramines unpleasant taste, odor as well as other chemicals present in the water.

Then there is the 0.0001-microns RO membrane in the 4th stage which traps more than 1000 known contaminants in water including fluoride, arsenic, chlorine, fertilizers, pesticides and heavy metals. 

The 5th stage is a fine GAC filter which further clears residual contaminants from the water as it leaves the Ro tank.

UV Light Filter

On top of the standard 5-stage filtration process, the iSpring RCC7U features a UV filter in a stainless steel housing which forms the last stage of the system.

Chlorine is used in municipal treatment plants to kill off bacteria and microorganisms. However, the 5-stages of the RO system completely removes all the chlorine present in the water.

The side-effect of this is that the risk of these microorganisms growing back into the RO water as it’s stored in the RO tank or passes through the tubing is increased. This is where the 6th stage of this iSpring RCC7U model comes in handy.

The filter uses an 11W UV sterilization lamp which passes UV rays into the RO water killing up to 99% of all the bacteria, viruses, mold spores, cysts and other microorganisms that are likely to grow in the water.

The combination of this UV filter and the standard RO process makes RCC7U really effective in not only removing contaminants but also dangerous microorganisms that might be present in the water.

Another commendable thing about this filter is that it comes with a smart flow sensor which automatically turns the UV lamp on and off with water flow.

It turns on the UV light immediately it detects flow and turns off again automatically when you turn off the tap. This way it guarantees greater efficiency and saves power in addition to lengthening the service life of the UV lamp.

Filtration Capacity

Same as the RCC7, the RO membrane of the RCC7U model can deliver up to 75 gallons of filtered water per day. Like I mentioned earlier, this is fairly high output for a residential RO system and should be enough to cater to the daily water needs of most households.

The unit also doesn’t generate a lot of wastewater. For every gallon of clean water it produces, about two gallons get wasted and that’s within the range of many under-sink systems you will find on the market.

Installation and Maintenance

Setting up the RCC7U can typically take a few hours but the process is relatively simple since it’s designed for DIY installation with all parts and instruction manual included.

The entire unit will fit easily in most under-sink cabinets. However, you will need to ensure you have a power supply nearby the cabinet for the UV filter. That might be the only challenging part as far as installation is concerned.

To sum it all, the iSpring RCC7U is indeed a wonderful RO system that no doubt guarantees extra quality water. If you use well water or have concerns about the possibility of bacteria in your water, then you might want to consider getting this iSpring RO system. 


  • Removes more than 1000 contaminants in the water
  • UV light filter absolutely kills all microorganisms
  • Smart flow sensor automatically turns the UV lamp on and off
  • A fairly high output of up to 75 gallons of water a day
  • A decent 1:2 pure to wastewater ratio
  • Comes with a 3-year limited warranty and lifetime support


  • Requires power supply which may make installation under the sink a bit challenging

Read moreiSpring RCC7U Reverse Osmosis System [UV Sterilizer]

iSpring RCC7D RO System Reviews

The iSpring RCC7D is an RO deionization filtration system specially designed for anywhere that ultra-pure water with zero total dissolved solids (TDS) is required.

It provides complete water purification via six individual filtration stages that include a specially manufactured deionization (DI) resin filter which makes a superb option for either aquarium use or drinking water.

Filtration Process

The early filtration stages of the RCCD7 are the same as the RCC7 and the other iSpring RO systems.

The five stages feature the 3 carbon pre-filters that capture large contaminants and volatile organic carbons in the water. They as well ensure chlorine, chloramines and other chemicals are removed in the water ahead of the RO membrane.

The TFC RO membrane completely removes all the contaminants that are larger than 0.0001 microns while the fifth stage coconut shell post-filter further captures any residual chlorine and chloramines that sipped through the RO membrane.

Deionization Filter

The last stage of the iSpring RCC7D is the specially designed deionization resin filter and it’s what sets this model apart from most other similar systems in out there.

It’s a super-efficient deionization post filter which completely removes the total dissolved solids (TDS) in the filtered water that the RO membrane could not capture.

It effectively uses ion exchange resins to clear all the dissolved contaminants bringing the water to 99.99% purity with close to 0 ppm TDS.  

In other words, it delivers the purest water possible, even purer than distilled water which makes the RCC7D ideal for use in aquariums, laboratory testing, and cleaning.

The water produced by the system is also safe for drinking, but considering that all the TDS and minerals are completely removed, it may taste plain or unpleasant to most people.

However, if your tap water is hard and you don’t mind the taste, then you can certainly use this system to soften your tap water hardness level and produce clean and highly pure drinking water.

Filtration Capacity

With regards to filtration capacity, the RCC7D will give you a maximum of 75 gallons of clean water per day which is sufficient for larger freshwater aquariums, reef aquariums, and fish breeders.

It’s as well enough for small to medium-sized families if you are using it for drinking water. It wastes around 2 gallons for every gallon of water it produces, so it’s equally quite efficient.

Installation and Maintenance

The installation process for the RCC7D can be a bit confusing but the instruction manual is clear and well organized plus there are videos that guide you through the process. All the parts are included and the unit is small enough to fit under most standard kitchen sinks.

In general, we would highly recommend the iSpring RCC7D to anyone who is looking for a system that can give them the purest water with almost zero TDS value.

The combination of the RO filtration process and the deionization filter will absolutely give you clean, clear and water with maximum purity possible ideal for your aquarium or drinking.


  • Captures all the contaminants including chlorine
  • Super-efficient deionization filter clears all the dissolved contaminants
  • Fairly large filtration capacity of 75 gallons a day
  • Suitable for drinking water, aquarium and applications that need pure water
  • Everything required for the installation is included
  • Relatively easy to install and comes with 1-year limited warranty


  • Produces ultra-pure water which may taste plain

Read moreiSpring RCC7D RO System Reviews

iSpring RCC7P-AK RO Filtration System Review

The iSpring RCC7P-AK is exactly identical to the RCC7AK model except that it comes equipped with a booster pump making it an ideal choice for those households where the feed water pressure is below 40 psi.

Filtration Process

Like the RCC7AK, this unit is a 6-stage reverse osmosis system with the first three stages offering a combination of three prefilters with polypropylene sediment filter in the 1st stage, GAC (KDF) filter in the 2nd stage and a carbon block filter in the 3rd stage.

Together they remove all large contaminants down to 5 microns as well as chemicals such as chlorine and chloramines. They also remove any unpleasant odor and tastes in the water.

The fourth stage RO membrane eliminates up to 99.99% of all the remaining contaminants in the water down to 0.0001 microns which include fluorides, arsenic, lead, bacteria, viruses, VOCs and much more.

In the fifth stage is a fine GAC filter that removes residual contaminants from the RO tank. The final stage is an alkaline remineralization filter comprising of minerals stones and calcite media.

The filter restores the healthy minerals (calcium, magnesium, potassium and sodium) into the water while raising its pH to give purified water with a more pleasant natural taste.

Booster Pump

If your source water pressure is low (below 45psi), then the iSpring RCC7P-AK model will solve this problem as it features a built-in booster pump that can raise the pressure up to 80 psi.

By boosting the pressure, the pump ensures the system works effectively regardless of any pressure variations and as well improves its production speed.

Filtration Capacity

The iSpring RCC7P-AK RO membrane can produce 75 gallons of water every day which is enough to meet the daily water demands of small to medium families. 

The tank can hold up to 3.2 gallons which pretty much a standard capacity for almost all the tanks that are included in iSpring’s RO systems.

For each gallon of purified water it produces, the unit wastes around 2 gallons, so it’s equally fairly efficient like its counterpart the iSpring RCC7AK above.

Installation and Maintenance

When it comes to installing this RCC7P-AK model, it’s a quite a straightforward DIY process provided you have some technical skills.

All the necessary parts and tools for installation are included plus a clear manual and you can even get instructional videos in YouTube to guide you through the whole process. The unit is 19 inches tall, so it will fit under any kitchen sink with a 21” space in height.

Maintenance is as well a breeze. The pre-filters and the AK filter require replacing every 3 to 6 months. The RO membrane will last 2 to 3 years while the fifth stage filter can go for a year before requiring replacement.

The pump and the system operate nearly noiselessly such that you can barely hear any sound over normal kitchen activity. It won’t cause any disturbance at all plus the pump automatically turns once the tank is full.

If there’s any set back to point out it would probably be the fact that the service life of the prefilters is a bit short especially in case of very hard water. Other than that, this is a great reverse osmosis system to consider for those with low source water pressure.


  • Removes 99.99% of all contaminants in water
  • Restores the natural minerals and alkalinity of water
  • Booster pump increases pressure to optimal levels
  • Delivers 75 gallons of water a day
  • Installation is fairly easy and the system operates quietly
  • Comes with one year warranty and a one-year money-back guarantee


  • The prefilters are not that durable

Read moreiSpring RCC7P-AK RO Filtration System Review

iSpring RCC1UP-AK RO System Reviews

iSpring RCC1UP-AK is quite identical to the RCC7AK-UV model above except that it includes a booster pump which the RCC7AK-UV does not have.

In all of iSpring’s RO systems we’ve reviewed, this is the most comprehensive model. It basically has everything you would want in an RO system.

Filtration Process

Similar to the RCC7AK-UV, the iSpring RCC1UP-AK is a 7 stage RO system and it uses the first 5 stages of the RO filtration process to very effectively eliminate all the unwanted impurities in the water including chlorine, odor, and unpleasant tastes.

Alkaline Remineralization Filter

To replenish the lost minerals removed by the RO process, the stage 6 of the RCC1UP-AK makes use of an alkaline remineralization filter which has red mineral stones that add back the healthy natural minerals to the RO water.

The stones add calcium, magnesium, potassium and sodium ions to the water which make the water mineral-rich and healthy almost like the spring waters.

Aside from the mineral stones, the filter has calcite media which adjust the pH level of the filtered water bringing it to a more neutral to alkaline level. This, in turn, enhances the taste of the RO water making it much refreshing to drink. 

UV Sterilizer

Stage 7 of the RCC1UP-AK RO system comprises of a UV sterilizer filter which utilizes the powerful iSpring’s 11W UV lamp. The lamp emits strong UV light which penetrates the water to clean off all the organic microorganisms from the water.

This stage is very essential especially if your water is from a well or any other water source that is likely contaminated with germs and microorganisms such as streams and lakes.

The UV lamp is controlled by the iSpring’s smart flow sensor switch and it works flawlessly turning on the UV light automatically when there’s water flow and switching it off when no water is flowing but with around 3 minutes delay.

As I’ve mentioned severally in the other reviews, this sensor is thoughtful addition that ensures the efficiency and durability of the UV lamp plus it helps cap the power consumption.  

Booster Pump

Now, what makes the RCC1UP-AK impressive the most compared to its predecessor, the RCC7AK-UV model is the addition of a booster pump.

Unlike the other previous models, the pump that comes with this RCC1UP-AK system is a new and upgraded version that’s designed to work even more efficiently. The pump is capable of increasing the feed water pressure from as low as 30 psi up to 80 psi.

It ensures that the RCC1UP-AK RO system maintains a more efficient and consistent performance throughout even with variations in source water pressure. This makes the RCC1UP-AK an ideal choice for homes that experience lower water pressure.

Filtration Capacity

The other thing that puts the RCC1UP-AK ahead of the RCC7AK-UV model is its high production capacity. It’s equipped with the same quality RO membrane found in the iSpring RCB3P and RCC1UP models which produces up to 100 gallons of pure water per day.

This high filtration capacity means that the RCC1UP-AK is more than capable of suiting the water demands of families of large families.

Even much better, the booster pump enhances the production speed of the unit which means it will fill the RO tank much faster. It also helps reduce the amount of wastewater generated by the system in comparison to pumpless models. For every gallon of pure water, the system produces only 2 gallons of wastewater which is quite a decent ratio.

Installation and Maintenance

Setting up the RCC1UP-AK may prove a little bit challenging as it a comprehensive RO system. Nonetheless, it does come with everything necessary to install it including a clear instruction manual, so if you are a handy person, it may not pose many challenges.

Maintaining it is not that hard though as it only requires regular cleaning up and changing of the filters every 6 to 12 months for the three prefilters and 1 to 3 years for UV filter and RO membrane. The post-carbon filter and the alkaline filter need changing once every year.

We couldn’t find any serious downside to this unit. However, although the flow sensor switch help minimize power consumption, the fact that both the pump and the UV lamp use electricity will likely raise your power bills but not too high.

To sum it all, the RCC1UP-AK is a perfect option for those who want a more comprehensive RO system that can very effectively deal with all kinds of contaminants and deliver the purest water. It’s especially great for households that often face low water pressure.


  • Effectively removes all contaminants in the water
  • Adds back lost healthy minerals and balances the pH
  • UV sterilizer kills any microorganism lingering in the water
  • Booster pump raises the water pressure to ideal levels
  • High filtration capacity of up to 100 gallons a day
  • Decent 1:2 pure water to wastewater ratio
  • Comes with a one-year limited warranty and 30-day money-back guarantee


  • A little bit challenging to install without basic DIY skills Requires electricity which may slightly raise the power cost

Read moreiSpring RCC1UP-AK RO System Reviews