Watts Premier 531417 RO Pure Plus Reverse Osmosis System

In the second position, we have the Watts Premier 531417 model which is another incredible standard under sink RO system from the company that offers an effective water filtration process. The unit is quite identical to the Watts Premier WP531411 model with the only differences being the faucet type and the special carbon block post-filter.

Filtration Process

Same as the WP531411 system, this Watts Premier 531417 model utilizes a 4-stage filtration process to clean and purify the water.

Stage 1 consists of a sediment pre-filter that clears out rust, sand, silt, dirt, coarse sand, scale and other suspended particles from the water down to 5 microns.

It’s followed by a 5-micron carbon block pre-filter in the 2nd stage which ensures a greater reduction of chemical contaminants especially chlorine, chloramines and other common chemicals that often cause unpleasant tastes and odor.

In the 3rd stage, the system uses a 0.0001-micron reverse osmosis membrane that’s capable of eliminating up to 98% of the remaining contaminants. It will clear out heavy metals, total dissolved solids, chemicals and microorganisms like cysts, viruses, and bacteria.

Stage 4 of the unit features a special VOC carbon block post-filter. This is a high-quality 1-micron filter that not only refines the water by removing residual tastes and odors from the tank but also helps further remove VOCs (volatile organic compounds) such as THMs, pesticides, and herbicides from the water making it cleaner and safer for drinking and cooking.

Filtration Capacity and Efficiency

At optimum feed water pressure which is 60 psi and above, this Watts Premier RO system can output up to 50 gallons of pure water in a day. It’s the same capacity as the WP531411 model and just enough to meet the demands of a small or medium-sized family.

With regards to efficiency, the Watts Premier 531417 wastes around 4 gallons of water to deliver a gallon of purified water.

It’s not really that efficient but with consistent high feed water pressure, the ratio can drop to 3:1. The system is designed to work with an incoming water pressure of between 40 to 80 psi.

Installation and Maintenance

You would break no sweat setting up this unit as the installation process is pretty simple and anyone with basic DIY skills can get it done under 2 hours.

It has a slim, space-saving design like its counterpart above, the WP531411 model hence it’s ideal for a small kitchen and will fit inside any under sink cabinet effortlessly.

Maintaining the unit is easy too. The filters and membrane cartridges are designed for quick changing. You simply press the filter, then twist it and pull it out. There are built-in check-valves installed in the manifold to ensure no messy or fussy change-outs.

The maximum life span of the two pre-filters is 6 months while the carbon post-filter can last for one year and the RO remembrance for 2 to 5 years.

This model is also equipped with a TDS sensor in the faucet with a red and blue LEDs indicator. It’s a nice bonus that will let you when it’s to change the filters to make sure the system maintains an optimum performance. 

Overall, aside from the slightly high wastewater to pure water ratio, the Watts Premier 531417 is a worthwhile alternative to the WP531411 model above for small homes or anyone looking for a highly affordable under sink RO system.


  • Adequate 4-stage RO filtration process
  • Suitable for small and medium-sized families
  • Simple installation process and maintenance
  • Slim design fits easily in most under-sink cabinets
  • TDS sensor indicates when it’s to change the filters
  • Highly affordable unit backed by a 3-year warranty


  • Slightly high wastewater to pure water ratio of 4:1
  • Doesn’t work efficiently with a feed water pressure of below 40 psi

Product Overview

ProductWatts Premier 531417 RO Pure Plus Reverse Osmosis System
BrandWatts Premier
Rating4 out of 5 stars (4 / 5) (More than 36 reviews)
Recommended price208 USD (Check the latest price at Amazon.com)

Product Specifications

Pre-filtersStage 1 – 5 Micron Sediment Filter
Stage 2 – 5 Micron Pre-Carbon Block Filter
RO membraneStage 3 – 50 GPD Semipermeable Membrane
Post-filtersStage 4 – A high-quality VOC Carbon Block Final Polishing Filter
Incoming Water Pressure40-80 PSI
Storage tank3-gallon capacity
FaucetBrushed Nickel
Fitting adaptors3/8” Stem & 1/4” Quick connect fitting adapter
Filtered Water to Waste Water Ratio1:1.5
Alkaline / pH+ RemineralizationNo
UV FilterNo
Booster PumpNo
– NSF/ANSI 372
– NSF/ANSI 58 Certified
DocumentsInstallation Manual [PDF]
User Manual [PDF]
Warranty [PDF]


Installation Guide

This video shows you step-to-step how to install Watts Premier RO Pure & Pure Plus Reverse Osmosis System.


Does the pump help in supplying stronger water flow out of the faucet?

No, it doesn’t, the pump is used for creating more pressure at the water inlet, not at the outlet or storage tank.

Images Gallery

Watts Premier WP531411 4-Stage Reverse Osmosis System

Watts Premier WP531411 4-Stage Reverse Osmosis System

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