APEC RO-90 Reverse Osmosis Filter Review

The APEC Water RO – 90, reverse osmosis (RO) filter system, is the higher output version of the highly popular APEC Water ROES – 50 .

The RO – 90 is rated at 90 gallons of pure water per day, based on the industry standard of a water feed supply at 60 psi and 77 degrees f. that makes this system ideal in situations where there is a high demand for pure water or it is located where the feed water pressure is low. With a feed of 50 psi, this system will still produce 75 gallons per day.

In common with other APEC Water RO systems, the RO – 90 comes complete with everything that you will need to install the system, including Teflon tape.

The system produces filtered water by means of a 5 stage filtration system.;

1st Stage – this stage is a pre-filter stage that removes sediment including dust and rust. This also helps extend the life of the RO membrane

2nd and 3rd Stages – consists of two carbon block filters – these remove chlorine, odors, tastes and any discoloration or cloudiness, as well as VOC (volatile organic compounds) and other chemicals from the water

4th Stage – this is the high rejection TFC RO membrane. This removes a wide range of contaminants including arsenic, bacteria, lead, fluoride, chromium, radium amongst others.

5th Stage – the final stage is a coconut shell refining carbon filter — this removes any possible residual taste from the water before it enters the 4-gallon storage tank.

Follow this link to see a complete list of the removed contaminants.

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Filtration System Design

The RO – 90 is a filter and filter holder design. This means that each of the filters along with the membrane are removed from the filter holder and then the new filter or the membrane is fitted back into the holder and the holder reattached to the manifold.

The 1st 2nd and 3rd stage filters require replacement at intervals of between 6 and 12 months. The frequency of replacement depends of the quality of the feed water. Replacement of these filters is quite simple and quick to do. Just loosen the filter housing with the ‘C’ spanner that is supplied with the kit, then unscrew by hand. Remove the old filter and replace with the new one. Screw the filter housing back into the manifold and tighten with the ‘C’ spanner.

The RO membrane (4th stage) and the 5th stage filter element are replaced at between 2 to 3 year intervals, again this frequency of replacement depends on the quality of the feed water.

Water Efficiency

In common with all RO systems, the feed water is used to flush and clean the RO membrane. This flushing water is often wasted. APEC have suggested that the waste water can be diverted rather than flushed straight down the drain and be used for watering gardens or filling ponds. If you have fish in your pond, you may wish to check the waste water before use as the quantity of contaminants will be typically slightly higher that would normally come out of your faucet.

The amount of water needed to flush the membrane varies greatly depending on the pressure of water that is feeding the system, but typically with the APEC RO – 90, 3 gallons of water is wasted for every 1 gallon of pure water produced.

Ease of Installation 4.6/5

The complete APEC ROES – 50 is a compact system that is designed to be installed in a small under counter base unit although it can be installed anywhere there is a convenient water feed line. The whole system is designed to be installed by a do it yourself of average skill levels in about 1 hour with minimal DIY tools that most households will already have. To help with installation all the tubes are color coded depending on where they connect to.

The system is designed to be installed where the water pressure coming into the filtration unit is between 40 to 85 psi. for lower water pressures an alternative system of a pressure boosting pump may be needed.

The installation and user manual is quite detailed and easy to follow, but it is worth taking a look at these following videos produced by APEC Water before you start as they do show how easy the system is to install.

Video 1 – Unpacking and checking the unit

Video 2 – Installing and fitting filter and membrane units

Video 3 – How to install the feed water and drain saddle adaptor

Video 4 –

Video 5 – Connecting the tubing connections and system start up


Up to 90 gallons of pure water produced each day (subject to water pressure)

4 stage filtration plus the RO filter

Designed for DIY install within about 1 hour

Competitively priced

Supplied with everything needed for a standard installation (including Teflon tape)

Filter life of between 6 to 12 months depending on condition of feed water

Membrane life of between 2 to 3 years

Removes up to 99% of contaminants

4-gallon pre-pressurized water storage tank

Manufactured in the US

US based technical support which is free for the lifetime of the product

1 year limited manufacturer’s warranty


The filters do not have an indicator to check when they need changing. The best way to check if the filters need changing to test the water occasionally with a TDS meter.

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Conclusion 4.8/5

In our APEC Water RO – 90 review, you can see what a very good RO system it is and why it is highly regarded. The high output capacity makes it and ideal solution for households where higher than average pure water is needed. This capacity also is a solution where low feed water pressure means that many standard output systems will not produce enough water without addition pressure increasing pumps.

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