APEC Portable Reverse Osmosis System [RO-CTOP]

The RO-CTOP is another excellent countertop RO system from APEC. It’s a hassle-free, portable unit that offers nothing but convenience and ease of use.

Like the RO-OCTOP-PH, APEC has designed two versions of the RO-CTOP model, one without casing (RO-CTOP) and another without casing (RO-CTOP-C). In this review, we look at the latter version, the RO-CTOP-C.

Filtration Process

The RO-CTOP-C utilizes a 4-stage RO filtration process that features the powerful filters and membrane found in APEC’s under-sink residential systems.

Stage 1 is occupied by a sediment filter made from polypropylene and it does well to trap dirt, silt, sand, rust and every large particle that’s bigger than 5 microns.

It’s followed by a coconut shell activated carbon filter with a large surface area that helps to efficiently get rid of chlorine, chloramines, odors, cloudiness, colors and unpleasant taste. The filter as well removes other common chemicals and VOCs like pesticides and herbicides.

Stage 3 of the system consists of the FILMTEC TFC RO membrane which is a super-effective membrane that deals with the tiniest and most difficult contaminants to remove. It clears out everything larger than 0.0001 micron which basically eliminates up to 99% of all the TDS and contaminants in the water from heavy metals to microorganisms and more.

Stage 4 which is the last part of the filtration process is fitted with an equally large capacity coconut shell carbon filter that serves as the post-filter and it performs the final polishing of the water by getting rid of any residual chlorine, taste, odor, particulates.

Filtration Capacity and Efficiency

With regards to water production, the RO-CTOP-C can output a maximum of 90 gallons of water in a day. The rate at which it will deliver water may be slow if your pressure is low but that’s much more capacity for daily use.

Not only is this capable of producing high amounts of water but it’s also surprisingly efficient than most of the other large under-sink systems from APEC.

It only wastes 2 gallons of water for each gallon of clean water it produces. This is lower than the 3:1 average ration on many APEC’s residential systems which is a big plus.

Installation and Maintenance

Aside from connecting the feed and wastewater hoses to the system and the pure water hose from the system to your faucet, no other installation is required. It’s that simple and straightforward.  It will hook up easily to any existing standard faucet.

The same simple installation applies too to maintenance as there’s nothing much you will need to do. All the filters are durable. You will only have to replace the pre-stage filters once every year. The RO membrane and post-filter need changing after 2 to 5 years.

One of the things we liked much about this particular APEC RO-CTOP-C version is that it’s quite compact and designed very well than RO-OCTOP-PH model above or its counterpart, the RO-CTOP-C.

All the filters plus the RO membrane are nicely enclosed in a cover and clipped to a backplate. Nothing is exposed to the open. The whole unit weighs about 10 pounds and measures 15.5 x 6.5 x 6.5 inches.

Therefore, it’s lightweight and highly portable especially with the complete encasing which makes it easy and convenient to carry it with you.

If you need a portable countertop RO system that can provide the same filtration power and efficiency like any large under-sink RO system, then this APEC RO-CTOP-C would suit you fine.


  • Filters out most of the TDS and contaminants in water
  • High water filtration capacity of 90 GPD
  • Relatively efficient with 2:1 wastewater to pure water ratio
  • Easy to install and requires not much maintenance
  • The lightweight, compact design makes it highly portable
  • Comes in two versions you can choose from


  • Fits no other types of faucets other than standard faucets
  • No water tank. It may take time to fill containers especially with low source pressure

Product Overview

ProductAPEC Portable Reverse Osmosis System [RO-CTOP]
BrandAPEC Water
Rating4.6 out of 5 stars (4.6 / 5) (More than 215 reviews)
Recommended price215 USD (Check the latest price at Amazon.com)

Product Specifications

Pre-filters1st stage: Sediment filter
2nd stage: Premium extruded carbon block
RO membrane0.0001 micron Top Tier Filmtec RO Membrane
Post-filtersAdvanced coconut shell refining carbon
Incoming Water Pressure40 – 80 PSI
TDS20 – 40 ppm
Storage tankTankless
Tubing 1/4 ” Color-code tub
FaucetNo faucet
Fitting & adaptorsQuick-connect adapters fit all the standards faucets.
Waste Water to Filtered Water Ratio3:1
FeaturedPortable countertop
No installation required
Fits all the standard faucets
FDA Certified JG Food grade tubing
2 year extended manufacturer warranty with registration.
DocumentsUser Manual [PDF]
Warranty [HTML]

Satisfying Chart

(Estimation from the verified purchase customers)


Installation Guide

This video shows you step-to-step how to install the APEC Water RO CTOP series Reverse Osmosis System.


Is this product NSF certified?

Yes, it is as you can see the NSF stamp on it.

Are the components BPA-free materials?

Yes, everything in this RO system is BPA Free.

Can I heat the filtered water from this RO system?

Yes, you can heat the filtered water that comes from this RO system.

Images Gallery

APEC Water RO-CTOP Reverse Osmosis System

APEC Water RO-CTOP Reverse Osmosis System
APEC Water RO-CTOP - Fittings
APEC Water RO-CTOP – Fittings
APEC Water RO-CTOP - 3 types of standard faucet
APEC Water RO-CTOP – 3 types of standard faucet
APEC Water RO-CTOP - How it looks
APEC Water RO-CTOP – How it looks
APEC Water RO-CTOP - Quick connect
APEC Water RO-CTOP – Quick connect
APEC Water RO-CTOP - Alkaline filter
APEC Water RO-CTOP – Alkaline filter
APEC Water RO-CTOP - Replacement
APEC Water RO-CTOP – Replacement

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