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apec water systems reviews

APEC RO-90 Supreme Reverse Osmosis System Review

The APEC RO-90 is a 5-stage under-sink reverse osmosis system. 

It contains double carbon blocks to remove virtually all chlorine, and other harmful chemicals and an RO membrane to get rid of microbes and total dissolved solids.

The APEC RO-90 uses long-life filters, making maintenance easier, and cheaper.

It is relatively easy to install with our only complaint being the poorly written installation guide. But there are helpful videos online you can follow.

For its price, the APEC RO-90 is an excellent buy for any family.

Thanks to its high daily production capacity of 90GPD, it is especially ideal for large families who use a lot of purified water for drinking, cooking, and preparing beverages.

 If the APEC RO-90 doesn’t meet your needs, we have other great recommendations in our recently updated best reverse osmosis water filters buying guide.


  • High-performance filters
  • Affordable
  • Long lasting filters
  • Easy to install and maintain
  • Great tasting water
  • Excellent customer service
  • High daily capacity (90 gallons/day)


  • Poor installation instructions
  • No remineralization stage
  • No permeate pump – causes low flow from the tap

Product Specifications 


  • Number of stages: 5
  • Production capacity: 90 gallons per day (GPD)
  • Type of water: Chlorinated city water
  • Reserve tank capacity: 3.2 gallons
  • Booster pump: no
  • Remineralization stage: no
  • Filter lifespan: 12months
  • Membrane lifespan: 3-5 years
  • Installation kit: yes

Best Features 

apec water ro-90

1. 5-stage Filtration System 

Here are the five filtration stages of the APEC RO-90 system.

Sediment filter: Removes large particulates, including dust, silt, and sediment. This not only cleans up water turbidity, but it also prevents an overload of the other filters, thus increasing the lifespan of all the filters.

Two carbon blocks: The water passes through two carbon blocks to remove odors, unusual tastes, chlorine and a host of other chemicals. Having dual carbon filtration ensures your water tastes fresh and is safe to drink.

FILMTEC RO Membrane: The RO membrane is left to deal with the stubborn contaminants remaining in the water. These include harmful bacteria, viruses, and cysts as well as heavy metals, fluoride, and dissolved salts.

Post coconut carbon filter: Water passes through the final polishing filter just before it comes out of the faucet, which removes any residual odors and tastes.

As you may have already noticed, the APEC RO-90 does not have a remineralization filter. If you are looking for that spring water taste of bottled mineral water, the RO-90 is not for you.

Despite the lack of remineralization, most customers say this is the best tasting water they’ve ever drunk.

2. High Filtering Performance

How long does it take for the APEC RO-90 to fill its tank?

It takes 2-3 hours for the 3.2-gallon tank to fill up. The actual time depends on your water pressure as well as the water temperature. The tank fills up fastest at a pressure of 70 psi and above.

The APEC RO-90 removes 99% of most contaminants in water, including fluoride, chlorine, arsenic, lead, microbes and many others.

Whether you are using well water or city water, the APEC RO-90 system produces the same great results.

Having two carbon block filters makes the APEC RO-90 more efficient at removing chemicals, and unpleasant tasted and odors.

It’s why the water tastes so good despite the lack of re-mineralization.

3. Long Life Filters

apec water systems reviews

If you are looking for a low-maintenance RO system, the APEC RO-90 is perfect.

Its filters last twice as long as other under-sink RO systems.

The first three filters, the sediment filter, and the two carbon filters are good for 12 months. Standard filters last only 6 months.

The RO membrane lasts 3-5 years. In most RO systems, the membrane lasts 2-3 years.

Even the post filter lasts forever; 3-5 years to be more precise.

Unlike other RO systems, you don’t have to keep buying new filters every few months.

4. Average Water Efficiency 

The APEC RO-90 does not come with a booster pump. But it still achieves a decent wastewater to purified water ratio of 3:1.

That means it drains 3 gallons for every gallon of purified water. This is better than the standard 4:1 ratio of most RO systems in this price range.

5. High Daily Production Capacity 

The APEC RO-90 has one of the highest daily production capacities among RO systems in the same price range.

It can produce up to 90 gallons a day under optimal conditions (the right water pressure and temperature).

This makes it the right choice for large families that need a lot of drinking water as well as families that use purified water for cooking and other activities in addition to drinking.

Installation and Maintenance 

APEC RO-90 Modern Design

Can I connect the APEC RO-90 to my icemaker or fridge?

 Yes, you can, but you’ll need the APEC icemaker/fridge connection kit, which they sell separately. If you get the icemaker kit, we also recommend adding a booster pump to make sure the water reaches your icemaker or fridge with ease.

The APEC RO-90 is designed for DIY installation.

The instructions are not clear, but there are several helpful videos online you can follow.

It takes about 2-3 hours to install the 5 filtration systems under the sink, hook them up to the reserve tank, install the drain saddle, install the new faucet (may require drilling a new hole in your sink) and connect all the tubes in the right places.

A good thing about the APEC RO-90 is that you don’t need to mount it. It sits conveniently on the floor under the sink.

This not only makes installation easier, but it also makes maintenance less tedious because you never have to dismount the system.

Note that you can install the system anywhere there a cold water line if the under-sink installation is not possible perhaps because of lack of space.

Just make sure it’s not too far away from the faucet and that there is enough water pressure. You’ll also need to have an open drain line.

You also have some flexibility when it comes to mounting the faucet.

If you don’t want to go through the trouble of drilling a new hole for it, find a way to mount it on the wall.


Which Filters in the iSpring RCC7AK do I need to replace? 

  • Sediment filter (12 months)
  • Two carbon filters (12 months)
  • RO membrane (3-5 years)
  • Post carbon filter (3-5 years)

Note: Well water users may need to replace their filters sooner.

The APEC RO-90 is a low-maintenance RO system. Once you’ve set it up, you only need to check for leaks regularly.

As the system approaches 12 months of usage, have replacement filters ready for the sediment and carbon filters.

As for the RO membrane and post-carbon filter, replace them after 3-5 years.

Replacing the 3 pre-filters is easy and quick.

Use the plastic wrench included to loosen the filter houses and remove the old cartridges. Remember to wash the housings with mild soap and rinse before putting new cartridges in.

Replacing the RO membrane and post-filter is just as easy.

What We Like The Most about the APEC RO-90 System

amazon reverse osmosis

Great value: You get excellent filtering performance and long filter life for less money.

High daily capacity: The RO-90 produces up to 90 gallons a day. That’s plenty of purified water to meet the needs of any family.

Long filter life: No need to keep changing the filters. The RO-90 uses extra high capacity filters that last twice as long as standard RO filters. You save money and spend less time on maintenance.

What We Don’t Like About It

apec water systems reviews

1. Low Flow Rate 

Because the system doesn’t come with a booster pump, the water comes out of the faucet at a low flow rate.

It’s tedious to fill up a large water bottle or pitcher.

The lack of a booster pump also leads to more wasted water. RO systems with a pumped waste as little as 2 gallons or just 1 gallon or every gallon of purified water.

Luckily, you can buy a booster pump separately and hook it up to the RO-90 system.

2. Poor Instructions 

The installation manual is not very clear on some of the steps.

Don’t rely entirely on it when installing the RO-90. Check some installation videos online and on APEC’s official website. They are very helpful especially for those who are installing an under-sink filter system for the first time.

The APEC RO-90 Reverse Osmosis System is Perfect for You If…

apec reverse osmosis
  • You are looking for an affordable but high-performance under-sink RO system.
  • You want a reverse osmosis system that is easy and cheap to maintain.
  • You want a high-capacity RO system that can provide adequate drinking water for a large family.

Avoid Buying This One If…

apec reverse osmosis
  • You want a high-efficiency RO system with minimal water wastage.
  • You prefer an RO system with a remineralization stage.

Our Bottom Line 

Apec RO-90

If you are looking for a reverse osmosis system that doesn’t cost much, is cheap to maintain and produces high tasting water, the APEC R0-90 is a great choice.

Considering its level of performance and the extra-long filter life, the APEC RO-90’s price is a bargain.

It pays for itself in no time by replacing your bottled water purchases.

Ed Carmichael

About the Author Ed Carmichael

Ed is a water specialist in Tampa, FL. He built to help his friends and family learn about DIY solutions to common water quality issues in the home.

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