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APEC ROES-PH75 Alkaline Mineral pH+ Reverse Osmosis System

APEC ROES-PH75 Alkaline Mineral pH+ Reverse Osmosis System Review

The APEC ROES-PH75 is a 6-stage RO system that produces alkaline mineral water.

The water is not as alkaline as that from a water ionizer, but it’s healthier and tastier than the acidic water most RO systems produce.

In addition to the pH stage, there are 5 filters that remove hundreds of contaminants, including bacteria, viruses, and heavy metals.

The ROES-75 has a daily capacity of 75GPD, making it ideal for both small and large families.

Read on for our full review of the APEC ROES-PH75 reverse osmosis system.

 If you are looking for a cheaper RO filter, we have reviewed several affordable systems in our best reverse osmosis water filters buying guide.  


  • Produces alkaline mineral water – it’s healthier and tastier than normal RO pure water.
  • DIY installation and easy maintenance.
  • High daily capacity.
  • High performance filtration.
  • Long filter life.


  • No booster pump meaning the flow rate is low and the system wastes more water.

Product Specifications 


  • Number of stages: 5
  • Production Capacity: 50 gallons per day (GPD)
  • Wastewater to pure water ratio: 3:1
  • Reserve tank capacity: 3.2 gallons
  • Booster pump: no
  • Remineralization stage: no
  • Filter lifespan: 6-12 months
  • Membrane lifespan: 2-3 years
  • Installation kit: yes

Best Features


1. 6-Stage Filtration System Design

The ROES-PH75 consists of five filters plus a remineralization stage. This makes it slightly more expensive than basic 5-stage RO systems. But in return, you get great tasting water.

Here are the 6 stages in more detail.

5-micron sediment filter: This filter protects and extends the life of the other filters by removing sediment, rust, and other large particles that would clog the system.

Double 10-micron carbon block filters: The next two stages consist of two carbon blocks that remove the unpleasant taste of chlorine and other chemicals, remove water cloudiness/turbidity and give the water a fresh smell.

Reverse osmosis membrane: The high rejection membrane removes hundreds of contaminants including fluoride, lead, arsenic, bacteria, viruses and cysts. It also reduces the water’s TDS (total dissolved solids) levels.

Coconut shell post carbon filter: A refining filter gives water a final polish to remove residual tastes and odors.

pH filter: The APEC ROES-PH75 goes one stage further than most RO systems. A final pH filter adds calcium carbonate to the water just before it comes out of the faucet. This increases water alkalinity, making the water healthier and tastier.

The other major component of the ROES-PH75 reverse osmosis system is the 3.2 gallon pressurized tank.

It stores reserve water, ensuring you have purified water available anytime.

2. Great Filtering Performance

The 5 primary filters are capable of filtering out thousands of impurities ranging from the harmless ones like chlorine to harmful contaminants like waterborne bacteria.   

The 3 pre-filters focus on clearing up the taste, odor and appearance of the water while the RO membrane deals with the tough-to-remove contaminants like lead and dissolved salts.

The pH filter is not essential to the filtering performance. The ROES-PH75 will still produce safe clean water even if you get rid of the final stage.

But, if you want that spring-like bottled water taste, you’ll appreciate the pH filter.

Another benefit of this remineralization stage is that it balances out water acidity. The water comes out slightly alkaline, which has potential health benefits.

The water is not as alkaline as that produced by a water ionizer, but it’s better than the acidic water most RO filters produce.

3. Average Water Efficiency

The ROES-PH75 has wastewater to pure water ratio of 3:1. It drains away 3 gallons for every gallon of pure water.

The drained water is used for flushing away impurities trapped by the RO membrane.

The 3:1 ratio is not the industry-best (highly efficient RO systems can achieve a 1:1 ratio) but it’s better than the 4:1 ratio of cheaper filters.

You don’t have to let all that water go to waste. You can collect the water and use it for gardening. It’s free of contaminants, that would harm your plants.

Alternatively, buy a booster pump and connect it to the system. It will increase the faucet flow rate and reduce the amount of water wasted.

4. High Water Capacity 

With a daily water capacity of 75 gallons, the ROES-PH75 is adequate for large families.

It easily keeps up with demand, quickly replenishing the reserve tank whenever someone drinks a glass of water or fills a water bottle.

The high capacity is also handy if you plan to use pure water for other things in addition to drinking, such as washing vegetables or for your pet.   

Installation & Maintenance

apec roes-75 manual

The APEC ROES-PH75 is designed for homeowner installation. All the parts and fittings you need are included, and you only need basic tools to complete the setup.

The system comes partly assembled. The RO head is already put together. The membrane, post-filter and pH filter come already inserted in their housings.

So you just need to insert the three pre-filters into their housings and attach them onto the main head.

One thing we love about all APEC reverse osmosis systems is that they don’t need to be mounted on the wall under the sink.

You can just place the filters on the floor together with the reserve tank. This makes installation much easier and quicker.

If you don’t have enough space under your sink, you can install it anywhere else where you have access to a cold water line and a drain line.

Just make sure the new location is no more than 15 feet away to maintain water pressure from the tank to the faucet.

Overall, installation should take you a couple of hours. The most tedious part is drilling a hole in the drain line for drainage and another in your sink for the faucet.

The rest is easy. The tubes are colored so it’s easy to know which one goes where.

Filter Replacements 

ro water filtration system review

The pre-filters and the pH filter have a lifespan of 6-12 months.

If you receive city water, you should be good for around 12 months. But if you use well water, it’s wise to change the filters every six months to keep the membrane in prime condition.

Replacing the filters is easy.

Use the wrench included to loosen the filter housings and remove the old cartridges. Then follow the manual’s cleaning and sanitization process before putting in new cartridges.   

As for the membrane and carbon post-filter, they are good for 2-3 years.

The manufacturer sells the replacement filters as a set so you don’t have hunt down individual filters.

What We Like The Most About the APEC ROES-PH75


Good value for money: For what it costs, the ROES-PH75 provides more than we expected. Its filtering performance is on par with pricier systems, and the bonus pH filter makes it an even better bargain. All the parts are well made with a 2-year warranty to guarantee build quality.

Mineralization stage: If you love the taste of bottled mineral water, you’ll love the purified water from the ROES-PH75 just as much. The mineralization stage greatly enhances the water’s taste.  

Long life filters: With a 12-month lifespan (for city water users), the ROES-PH75 filters don’t need frequent replacement, making maintenance easier and cheaper.

What We Don’t Like About It 

APEC ROES-PH75 Alkaline Mineral pH+ Reverse Osmosis System

1. No Booster Pump Included 

This significantly reduces the flow rate of water out of the faucet, making it tedious to fill large water bottles and pitchers.

It also increases the amount of water that goes down the drain.

With a booster pump, the 3:1 ratio can go up to 1:1, meaning you lose only a gallon of water for every gallon of pure water.

Luckily, you are not out of options. You can buy a booster pump separately – either an electric one or a non-electric permeate pump – and connect it to the system.

2. Alkaline Water not Guaranteed 

Depending on the original pH of your tap water, the ROES-PH75 might produce alkaline water or it might not.

Some customers who tested their purified water found it to be around 7pH, sometimes even a bit lower.

If you want proper alkaline water, invest in a water ionizer.

The APEC ROES-PH75 Alkaline Mineral pH+ Reverse Osmosis System Is Perfect For You If...

ro water filtration system review
  • You are looking for an affordable RO system that produces mineral water.
  • You want an RO system that is easy to install and cheap to maintain.

Avoid Buying This One If…

  • You want an RO system that will fill up your water bottles fast.    

Our Bottom Line


APEC has always impressed us with their ability to make great products at great prices. The APEC ROES-PH75 is no different.

It delivers excellent performance and great tasting water at a pocket-friendly price.

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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