6 Best Alkaline RO Systems w/ Remineralization (2021 Reviews)

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One of the best ways to get alkaline water on tap at home is to install a reverse osmosis system with remineralization. In this guide, I share our top-rated alkaline RO systems. All of our picks come with inline mineral filter cartridges that boost the pH of your drinking water after it passes through the reverse osmosis membrane.

Do you already own a reverse osmosis system? We’ve got you covered. Toward the end of the guide, I’ll show you which remineralization cartridge is the best and how to choose the right one. Typically, mineral filter cartridges contain the alkaline minerals calcium, magnesium, and potassium.

Also, we’ll go over how to install an RO system with remineralization and ensure you get the most out of it. So, with those thoughts, let’s start with an overview of our current top picks that includes the most important specs to consider.

Model Specifications
#1) iSpring RCC7AK

  • Capacity (GPD): 75
  • Weight: 20 lbs
  • Dimensions: 14.5″ x 5.2″ x 18.5″ (LxWxH)
  • Stages: 6
  • Price: $$

  • Capacity (GPD): 90
  • Weight: 28 lbs
  • Dimensions: 15″ x 7″ x 18″ (LxWxH)
  • Stages: 6
  • Price: $$$$
#3) Express Water ROALKUV10M

  • Capacity (GPD): 100
  • Weight: 30.2 lbs
  • Dimensions: 15″ x 5″ x 17.2″ (LxWxH)
  • Stages: 11
  • Price: $$$
#4) HiKiNS RO-125G

  • Capacity (GPD): 125
  • Weight: 23.1 lbs
  • Dimensions: 14.6″ x 5.3″ x 16.3″ (LxWxH)
  • Stages: 6
  • Price: $
#5) APEC Portable RO-CTOP-PHC


  • Capacity (GPD): 90
  • Weight: 12.8 lbs
  • Dimensions: 16″ x 6.5″ x 6.5″ (LxWxH)
  • Stages: 4
  • Price: $$$
#6) Home Master TMAFC

  • Capacity (GPD): 50
  • Weight: 14.1 lbs
  • Dimensions: 20″ x 16″ x 13″ (LxWxH)
  • Stages: 5
  • Price: $$$

Best Reverse Osmosis Systems with Remineralization Reviewed

In this section, I share our in-depth reviews of each system and what to look for when choosing an RO system with remineralization. After the reviews, continue on to read our complete buyer’s guide with additional alkaline water solutions.

#1) iSpring RCC7AK Under-Sink RO System

We took several key factors into consideration while comparing our favorite alkaline RO systems, and in the end, we chose the iSpring RCC7AK as the best overall system for the money. We always check to ensure the systems don’t leak, install easily, and come with all the necessary parts.

We also investigate the companies behind the systems to verify that they’re trustworthy and selling reliable products. Plus, we consider the price of each system and check it against other similar systems to guarantee it’s a fair price.

The RCC7AK passed all of our tests. Since you’re shopping for reverse osmosis with remineralization, it’s important to check the mineral profiles of each system. It’s best to get a wider range of alkaline minerals including calcium, magnesium, and potassium for the tastiest end product. iSpring’s cartridge ticks that box.


  • Removes 99% of most water contaminants and up to 98% of lead (great for well water)
  • Removes fluoride (all RO systems in this guide remove fluoride)
  • Comes with a European-style brushed nickel faucet
  • Quick and easy leak-free under sink installation
  • Long filter life (first set of filters included)
  • Wide range of alkaline minerals including calcium, magnesium, and potassium
  • 30-day money-back guarantee and 1-year manufacturer’s warranty


  • Might not raise the pH of your water high enough (depends on the pH of your feed water)
  • Installation is not easy for everyone

#2) APEC RO-PH90 Reverse Osmosis System

Next, one of the most premium alkaline reverse osmosis systems in this guide is APEC’s RO-PH90. The filters in this system are made in the USA, and all the tubing is guaranteed food-grade. It comes with JG Quick Connect fittings to ensure you get a leak-free system that’s easier to install.

Plus, the high-purity calcium carbonate in the remineralization cartridge is sourced in the USA. The filters do an outstanding job of removing 99% of most water contaminants including heavy metals, fluoride, and chlorine. Also, this unit’s superior ability to remove heavy metals makes it a great choice for well water.

Overall, this system pumps out ultra-pure delicious drinking water. On top of that, APEC is one of the best water filtration companies in the country. They stand behind their products with leading quality certifications including a WQA Gold Seal.

Finally, the double carbon block filtration eliminates that icky chlorine taste Brita filters and common faucet filters often leave behind. Regardless of whether you’re treating well water or municipal water, the RO-PH90 will transform your tap water into crisp-tasting purified alkaline water.


  • USA-made filters and calcium carbonate
  • Attractive lead-free brush nickel finish faucet
  • FDA-certified and food-grade parts
  • 2-year warranty and lifetime customer support
  • John Guest fittings provide superior protection against leaks
  • 2X faster than competing systems without a pump
  • Powerful carbon filtration for better-tasting water


  • Adds calcium only to boost pH

#3) Express Water ROALKUV10M Alkaline UV Reverse Osmosis System

UV reverse osmosis systems do an excellent job of eliminating viruses, bacteria, microorganisms, and cysts that could be lurking in your tap water, particularly well water. This massive 11-stage reverse osmosis system by Express Water does the most thorough job of purifying your water of all the systems in our guide.

You also get a wide range of alkaline minerals including calcium, magnesium, and potassium. We refer to these minerals as the power 3 since they’re the most essential alkaline minerals.

Remember, all the best reverse osmosis systems remove fluoride because of the RO membrane’s microscopic pores. Therefore, the ROALKUV10M system does an incredible job of removing all common water contaminants including lead, chlorine, arsenic, and heavy metals.

Next, the ROALKUV10M has a fast flow rate of .8 GPM and sports a 100 GPD capacity to accommodate large families and high-demand residential applications. Also, Express made installation super easy for everyone by using a color coordination system for the connections and tubing. Additionally, the entire system is BPA-free and checked for leaks during the quality control process by an air injection pressure test.


  • Double-sealed filters for enhanced filter efficiency
  • Leak stop valve protects against flooding by automatically cutting flow to the system
  • Superior filtration with added UV water purifier powerful enough to kill E. coli


  • Tricky to install for some people
  • UV light requires a nearby outlet

#4) HiKiNS RO-125G Under-Sink RO System

The most affordable RO alkaline water filter system in this guide is the HiKiNS 150GPD 6-stage model with pH boost. This system also uses an inline remineralization cartridge to boost the pH of the RO water to a low alkaline level.

The greatest advantage of this system is its high daily output capacity of 150 gallons per day. The first five stages of the system include a sediment filter, coconut shell carbon, and the RO membrane to ensure you drink ultra-purified water. The sixth stage is the remineralization filter cartridge that contains calcium, magnesium, and potassium.

The parts are FDA/CE certified, and what we really like about this system is the low wastewater ratio of 1:1. Other units waste larger quantities of tap water to produce RO water which can lead to a higher water bill. If you prefer to fill a water jug and put it in your fridge to have cold filtered water on tap, this system is a great choice.


  • The low wastewater ratio of 1:1
  • Great value (the most affordable option on our list without sacrificing quality)
  • Superior leak-free design
  • Easy installation
  • 2-year guarantee


  • You may prefer a different faucet than the one included

#5) APEC RO-CTOP-PHC Portable Countertop Reverse Osmosis System

APEC RO-CTOP-PHC is the best countertop reverse osmosis system with remineralization. If you own an RV, motor home, vacation home, or condo, this system gives you the convenience of tankless portability. It’s also the easiest system to install. Simply install the diverter valve on any standard faucet to get an unlimited supply of purified alkaline RO water wherever you like.

The one downside is this unit creates more wastewater than other systems. So, it’s best to fill a large jug or water dispenser to use throughout the day. Next, you get the added benefits of APEC’s lifetime support and powerful USA-made filters. The 4-stage water filtration features a powerful RO membrane that does the heavy lifting to remove fluoride and other contaminants that standard water filters leave intact.

Lastly, the RO-CTOP-PHC comes with everything you need to install it. As for the remineralization cartridge, it contains the same food-grade calcium as the APEC RO-PH90 system. Overall, this is a portable RO system with remineralization at its finest. It’s perfect for renters and people who don’t have enough room beneath their sinks to install a system with a tank.


  • Tankless and portable
  • APEC-quality parts and a lifetime guarantee
  • Simple to install for anyone (no plumbing required)


  • Fewer filtration stages than the other RO systems
  • Makes more wastewater
  • Calcium only in the remineralization cartridge

#6) Home Master TMAFC Artesian Full-Contact Undersink RO System

The latest addition to our guide is Home Master’s alkaline RO system that blends unique design elements with long-lasting filters. At first glance, you might be wondering how this system works since the filters use an all-in-one modular assembly. While we do like the modular assembly for people who are low on space, the tubing may feel cumbersome and overly complicated to you.

One highlight of this system that sets it apart is its long filter life. According to Home Master, the three pre-filters only need to be changed once annually or every 2000 gallons. However, if you’re filtering high TDS well water and relying on the sediment filter in this system to do the heavy lifting, there’s a good chance the sediment filter will need to be changed more often than once a year.

What we like most about this system is the taste of the finished product. Of all the RO systems with remineralization on the market, there’s a good chance you’ll find that the Home Master TMAFC unit delivers the best-tasting water of the bunch. The reason behind the exceptional taste is the inclusion of calcium and magnesium in the remineralization cartridge along with Home Master’s “Full Contact” system.

In this system, the filtered water picks up minerals after it exits the RO membrane and once again when it exits the storage tank. Overall, this is an excellent system with only a couple of minor drawbacks that you’ll find in the cons section below.


  • There’s a good chance you’ll like the taste of the water produced by this system the most
  • Home Master’s unique Full Contact remineralization process with two remineralization stages
  • You may prefer the easy filter changes provided by the modular assembly
  • Super-long filter life
  • 5-year limited warranty


  • Home Master advertises 7 stages of filtration, yet there are 5 when factoring in the two remineralization stages
  • Higher wastewater ratio than other systems at 4:1
  • Lower max production of 50 GPD

Buyer’s Guide

Now that you’ve read all the best alkaline reverse osmosis system reviews, let’s check out what makes them the best. We’ll go over why reverse osmosis with remineralization is a better choice than plain RO water. Plus, as promised, we’ll show you the easiest way to modify an existing RO system to make your drinking water alkaline.

Is reverse osmosis water acidic or alkaline?

The answer to this question is straightforward. When your tap water passes through a reverse osmosis membrane, the membrane removes everything, including essential minerals. These minerals act as pH buffers. Without them, water pH drops below neutral.

RO water has a very low TDS (total dissolved solids) and is virtually demineralized water. Since there’s debate over whether it’s healthier to drink water with a minimum number of minerals, water filtration companies have begun manufacturing reverse osmosis systems with remineralization

Why is my RO water acidic?

When your feedwater passes through the RO membrane, the membrane strips the alkaline buffers from your water, but the carbon dioxide in the water – in the form of carbonic acid – passes straight through.

While carbonic acid is a weak acid, it’s strong enough to lower the pH of your RO water below 7 or neutral.

How much will an alkaline RO water purifier raise pH?

Each alkaline RO system raises the pH of your drinking water by a point or two. You typically get a low alkaline water pH of 7.5 to 8.5, which you might find tastes better than slightly acidic RO water.

How to Install a Mineral Filter Cartridge

The best way to modify your existing RO system to make alkaline RO water is to install a mineral filter cartridge. The key is to install it after the existing stages as the final stage before your faucet. You’ll use the same size hoses and quick-connect fittings as in your existing system.

Where to buy mineral filter cartridges? Click Here #ad to view the iSpring FA15 inline alkaline mineral cartridge. The FA15 contains FDA-grade Calcite and Corosex. Calcite and Corosex contain the alkaline minerals calcium, magnesium, sodium, and potassium. With this filter, you get a pH boost of between .5 to 1.2 depending on the pH of your feed water.

Is reverse osmosis water bad for you?

With all the misinformation floating around about alkaline water these days, you may have heard that plain reverse osmosis water is bad for you. This is a tricky statement.

There’s debate over whether RO water leaches vital minerals from the human body. One doctor does make a convincing argument, stating that mineral-free water such as RO water is “hungry water.”

He argues that a “chelation process” occurs when you drink RO water long term. During this chelation process, RO water attaches itself to vital minerals in the body and flushes them out.

The theory is that drinking plain RO water is unhealthy since a lot of people may already have mineral deficiencies due to a poor diet. To err on the side of caution, it’s wise to drink mineral water from time to time instead of drinking plain RO water only.

Overall, the easiest solution is to invest in one of the reverse osmosis systems with remineralization in this guide if you’re concerned about your daily mineral intake.

Remineralized Alkaline Water vs Ionized Water

Before you buy a reverse osmosis system with remineralization, it’s important to know the difference between alkaline water and ionized water. You may have heard of a water ionizer or alkaline water machine.

The filters in water ionizers don’t remove vital minerals from your water because ionizers require minerals to make ionized water. When your water passes through a water ionizer, it undergoes electrodialysis, a process that creates alkaline ionized water with molecular hydrogen.

I drink ionized water every day, and I find that it’s the most delicious and refreshing type of purified water.

With an alkaline reverse osmosis system, you’re simply adding alkaline minerals back to the plain RO water to boost the pH rather than ionizing to achieve an alkaline pH.

While remineralized RO water is tastier than plain RO water, you may find that it doesn’t quite have the same vibrant taste as ionized water.

The solution is to use a reverse osmosis system with remineralization along with a water ionizer.

How to Use a Water Ionizer with Reverse Osmosis

One of the advantages of a reverse osmosis system that you won’t find in standard water ionizer filters is fluoride removal. How can you use your existing reverse osmosis system with a water ionizer?

Here’s the good news. If you purchase an alkaline RO system, you can use the remineralized RO water with your water ionizer. This gives you the option to install a water ionizer later in line with your existing RO system after the RO filters.

Since your water ionizer requires minerals in your feed water to do its job, the remineralized water from your RO system works quite well. For best results, choose an RO system that adds a wider range of minerals including calcium, magnesium, and potassium.

Another added bonus is you avoid mineral buildup inside your water ionizer since RO water has lower mineral content.

Finally, when you pair reverse osmosis with an ionizer, choose a different system than APEC since APEC uses only calcium carbonate in its mineral filter cartridges. Or, use an APEC system with a mineral filter cartridge that contains a wider range of minerals.

How to Install/Replace Reverse Osmosis Filters and the Membrane

The RO membrane life is years longer than the prefilters and mineral cartridges. Here’s a breakdown of the typical filter life for each stage:

  • Sediment Filter: 6-12 months
  • Carbon Filters: 6-12 months
  • Alkaline Mineral Cartridge: 3-6 months
  • RO Membrane: 2-3 years

RO Filter Replacement Instructions with RO Membrane Replacement Procedure

  1. Turn off the feed water to the system by turning the needle valve clockwise
  2. Turn off the tank flow valve located at the top of the tank
  3. Once you cut the water supply, switch on the faucet to release the pressure inside the system
  4. Use the included plastic filter housing wrench to loosen the filter housing
  5. One by one remove the filters and replace them with fresh filters (during this process, you can choose to wash the inside of each housing with mild soap)
  6. Be sure to match the filters with their corresponding stages in the system before hand-tightening them back onto the system
  7. Tighten each filter housing with the filter housing wrench
  8. To replace the RO membrane, disconnect the hose from the quick connect fitting and unscrew the cap on the RO membrane housing
  9. Use needle-nose pliers to remove the old membrane and install the new membrane (avoid touching the fresh membrane with your fingers)
  10. Screw the membrane housing cap back on
  11. Reconnect the water hose to the quick-connect fitting, and you’re good to go
  12. At this time, you can open the feed water valve and tank flow valve

The video below shows you exactly how to replace reverse osmosis filters and the membrane from A to Z:

Bottom Line

Now you know how to choose the best reverse osmosis system with remineralization and why you may want to drink remineralized RO water rather than plain reverse osmosis water. If you want to upgrade your existing RO system to boost pH, stick with the mineral filter cartridge by iSpring mentioned earlier.

All in all, the best RO system for delicious purified water at home is one that adds minerals. In the end, you get bottled water drinking water on tap in your home, which is really hard to beat.

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