Best Alkaline Water Filter Cartridges

Mineral filters are no doubt one of the most reliable and convenient ways of remineralizing RO water and here we’ve rounded up the 10 best alkaline water filter cartridges that we found the most convincing in terms of quality and effectiveness in adding back minerals into RO water.

If you thinking of investing in an alkaline filter to enhance the pH of your water, then these 10 filters are worth checking out.

The Best Alkaline Water Filter Cartridge

We recommend the iSpring FA15 Alkaline Water Filter Cartridge as the best alkaline water filter cartridge based on its performance, its price, and how other customers review it.

10 Best Alkaline Water Filter Cartridges Review

iSpring FA15 Alkaline Water Filter Cartridge

iSpring FA15 is a high-quality inline alkaline water filter and it comes in two versions, a new upgraded version, and an older version.

Key Features:
  • Reduces not only harmful chemicals but also minerals
  • Easy installation and quick connection with a secure push-fit design
  • Long-lasting service life (6 months)

iSpring FA15 Alkaline Water Filter Cartridge Review

iSpring FA15 is a high-quality inline alkaline water filter and it comes in two versions, a new upgraded version, and an older version.

In this review, we look at the new iSpring FA15 version which comes with a few upgrades that make it much better than its older version and most other alkaline water filters in the market today.

The first thing that makes this upgraded iSpring FA15 model stand out is the set of media that it comes with. It’s a 3-lay mineralization filter cartridge made up of red mineral stone, calcite and corosex.

The purified RO water first goes through the mineral stone side (red), then moves through the calcite media side (white/clear) where it exits towards the RO faucet.

As the RO water passes through the filter, the three media restore back the lost minerals which include calcium, potassium, magnesium and sodium ions which in turn improve the pH level of the RO water.

The filter is capable of raising the pH level by 0.5 to 1.2 which makes it quite effective for use in areas where the source water has a very low pH level.

All the media and material used in making this iSpring FA15 filter are all-natural and FDA grade hence they are not only safe. They will leave no residues behind or further contaminate the water as the synthetic alkaline filters do.

The updated FA15 alkaline filter can work with any under-sink RO system. Unlike the older version, this one features a very secure push-fit quick connection for quick installation or replacement at the end of your RO system as the last stage.

You just need to screw the push-in connector on each end then attach a ¼” water tube on both sides. However, the flow direction arrow is not that well labeled like in the older FA15 alkaline filter but it can be installed in either direction.

The filter does not affect the normal flow rate of water and considering that it’s an inline filter, you won’t need to buy housing. It can last from 6 to 8 months depending on the pH level of your RO water.

Things we like

  • Reduces not only harmful chemicals but also minerals
  • Easy installation and quick connection with a secure push-fit design
  • Long-lasting service life (6 months)
  • Compatible with most RO water filtration systems

Things we don't like

  • Not reasonable price
  • Poor water taste and odor

Aquasana AQ-RO3-RM Alkaline Water Filter Cartridge

In the second position, we have the Aquasana AQ-RO3-RM which is another quality remineralizing filter that’s built to effectively restore back minerals stripped from water by the RO filtration process.

Key Features:
  • Very easy to install without tools or plumber
  • Removes up to 88 contaminants such as chlorine, heavy metals,...
  • The maximum flow rate is 35 GPD

Aquasana AQ-RO3-RM Alkaline Water Filter Cartridge Review

In the second position, we have the Aquasana AQ-RO3-RM which is another quality remineralizing filter that’s built to effectively restore back minerals stripped from water by the RO filtration process.

This remineralizing cartridge is made out of ground limestone and flowmag which are the media responsible for adding the lost minerals back into RO water as it passes through it.

The filter is capable of putting back healthy amounts of magnesium, calcium, and potassium into purified water, a mixture that helps balance the pH levels of the RO water.

It can raise the pH to near 7.0 which is an ideal level that ensures healthy drinking water that tastes much better than the pure RO water.

Installing the Aquasana AQ-RO3-RM is also pretty straightforward. It features a unique compression fitting which allows you to easily hook it directly in line after the post-filter in the RO system.

It uses 3/8” tubing, so you will have to get a 3/8” to ¼” reducer if your system uses a ¼” hose. The filter also offers a decent life service as it can last up to 1 year before requiring replacement.

The only unfortunate thing is that it’s not quite ideal for use with RO systems from other brands. It’s designed to work best with Aquasana RO systems.

Things we like

  • Very easy to install without tools or plumber
  • Removes up to 88 contaminants such as chlorine, heavy metals,…
  • The maximum flow rate is 35 GPD
  • Tested by NSF certified

Things we don't like

  • Not suitable for improving water quality

Hikins PH Plus Alkaline Water Filter Cartridge

HIKINS is a reputable high-tech manufacturer of water filtration systems as well as air purifiers. Their PH+ alkaline filter is one of the best models in the market and this attributed to its efficiency with regards to remineralizing RO water.

Key Features:
  • Straightforward installation
  • The inlet water pressure is up to 100 PSI
  • This product can improve water quality and smell very well

Hikins PH Plus Alkaline Water Filter Cartridge Review

HIKINS is a reputable high-tech manufacturer of water filtration systems as well as air purifiers. Their PH+ alkaline filter is one of the best models in the market and this attributed to its efficiency with regards to remineralizing RO water.

This high-performance filter is made up of natural mineral stone and calcite media that restore back the essential minerals to pure water.

The filter adds back calcium, potassium, magnesium and potassium ions into the water which were removed while purifying the water.

This mineral mixture can improve the pH level of the RO water to around 7.5 to 8.5 which helps balance your water hence giving you a much healthier and safer home drinking water.

Another commendable thing about this HIKINS alkaline filter is that it’s designed to work with a wide range of systems. It’s fully compatible with any under sink RO system.

It can work with APEC, iSpring, Express Water and other systems. The installation is very simple and the package comes with two connector fittings alongside the alkaline filter.

In general, if you are looking for a universal alkaline filter that can work with any RO system, then the HIKINS PH+ alkaline filter is worth considering. It can last from 3 to 6 months based on the quality of your feed water.

Things we like

  • Straightforward installation
  • The inlet water pressure is up to 100 PSI
  • This product can improve water quality and smell very well
  • Long filter life up to 6 months
  • Compatible with most water filters under sink or standard 10-inch RO systems

Things we don't like

  • Poor cutting thread might be cause leak and difficulty during installation
  • Not tested by NSF certified

Reverse Osmosis Revolution Mineral57 Alkaline Water Filter Cartridge

The Reverse Osmosis Revolution Mineral57 is a well-rounded alkaline filter and one of the top models that offer a wide range of minerals aside from the common ones other alkaline filters add into RO water.

Key Features:
  • Heavy metal ions and toxins can be absorbed into Maifan Stone
  • Ideal for mineralizing water, including 58 minerals for the human body
  • Reliabile and durable filter

Reverse Osmosis Revolution Mineral57 Alkaline Water Filter Cartridge Review

The Reverse Osmosis Revolution Mineral57 is a well-rounded alkaline filter and one of the top models that offer a wide range of minerals aside from the common ones other alkaline filters add into RO water.

The filter is made from maifan stone balls which contain all the essential minerals that include calcium, potassium, magnesium, copper, sodium, and molybdenum.

Aside from these common minerals, the filter as well adds other mineral elements such as SIO2, FeO, MgO, Fe203, CaO, Na2O, k2O, MnO, p2O5, TiO2 and much more including other trace elements that are beneficial to the human body.

Therefore, the mineralized water produced after going through this Reverse Osmosis Revolution Mineral57 filter not only has substantial health benefits but also a well-balanced pH level.

It will certainly raise the pH value of your RO water to a good alkaline range and make it taste much better.

In addition to providing a wide variety of minerals, the maifan stone balls in this filter can also improve the biological activity of your RO water dissolved oxygen concentration.

It has a very strong adsorption ability and will effectively remove harmful heavy metal ions as well as toxins in the water resulting in a clean, safe and healthy drinking water that is rich in mineral content.

In terms of installation, the Mineral57 filter will present no challenge at all. It’s easy to install and it’s compatible with any standard RO system with ¼” tubing.

Things we like

  • Heavy metal ions and toxins can be absorbed into Maifan Stone
  • Ideal for mineralizing water, including 58 minerals for the human body
  • Reliabile and durable filter
  • Enhances water taste very well

Things we don't like

  • Take note that this Mineral57 doesn’t change water pH
  • Does not come with instruction

APEC PHPLUSKIT-14 Alkaline Water Filter Cartridge

If you have an RO system with an alkaline stage or you want to include one in your current system to improve the quality and taste of your water, then you may consider getting this APEC PHPLUSKIT alkaline filter.

Key Features:
  • Effectively raise pH in the water
  • Water flow up to 0.5 gallons per minute
  • Can reduce lower TDS level in water

APEC PHPLUSKIT-14 Alkaline Water Filter Cartridge Review

If you have an RO system with an alkaline stage or you want to include one in your current system to improve the quality and taste of your water, then you may consider getting this APEC PHPLUSKIT alkaline filter.

It’s a 10” calcite filter that can fit any standard reverse osmosis system and effectively boost the pH of the RO water produced by the system.

The filter works by adding calcium carbonate mineral into the RO water which introduces calcium ions that not only neutralizes the acidity of the water but also raises its pH level.

It can increase the pH of your water from as low as 5 to about 8 to 8.5 which is a more balanced alkaline level. By reducing the acidity of the RO water, the filter also improves the taste of the water making it more pleasant to drink than the slightly-acidic plain RO water.

Another advantage of this APEC alkaline filter is that the calcite mineralizer used is a natural FDA grade material with self-limiting property, unlike other common remineralizing media.

When properly applied, it enhances the pH just enough to attain a non-corrosive equilibrium. Therefore, it won’t overcorrect the pH under normal conditions.

Plus it as well adds around 2 to 5 ppm of hardness into the water which is equally an excellent way of reducing the corrosiveness of low TDS water.

The filter is easy to install and you can choose from two options depending on the type of tubing your system uses. You can choose one with ¼” quick connect fittings or 3/8” fittings.

Things we like

  • Effectively raise pH in the water
  • Water flow up to 0.5 gallons per minute
  • Can reduce lower TDS level in water
  • Long service life (6 months)
  • Easy installation and no wrenches required due to quick-connect fittings

Things we don't like

  • Not suitable for well water with low pH
  • Price is a little bit higher than other filters

Water Filter Tec 43208-4165 Alkaline Water Filter Cartridge

This Water Filter Tec model is a fully packed alkaline water filter cartridge that features 5 different media that restore back all the essential minerals into the purified water after going through the reverse osmosis filtration process.

Key Features:
  • Can increase the alkalinity of water
  • The service life of filter is 1,500 gallons
  • High flow rate is approximately 0.75 gallons per minute

Water Filter Tec 43208-4165 Alkaline Water Filter Cartridge Review

This Water Filter Tec model is a fully packed alkaline water filter cartridge that features 5 different media that restore back all the essential minerals into the purified water after going through the reverse osmosis filtration process.

The Water Filter Tec filter offers the ultimate natural blend of ionically activated stones to turn pure water to good alkaline water.

It’s a five in one alkaline filter consisting of a mixture of alkaline calcite, bioceramic, tourmaline, mineral stone and ORP ball.

The first mineral stone, alkaline calcite is very effective at boosting the RO water pH to a higher level than regular alkaline filters. It can raise the pH from as low as 5.5 to 8 with only small contact.

The second one which bioceramic is based on Far-infrared rays that cause resonance with water molecules. It ionizes and activates the water molecules within the cells and blood thereby improving both your blood circulation and health condition.

The tourmaline stones are yet another precious stones that are included in this Water Filter Tec alkaline filter. It releases 0.06mAbiolectectricity into the RO water and generates negative ions.

It also electrolyzes the RO water as well as narrow the molecular beams. All these accounts for numerous benefits you will get from drinking the water remineralized by this alkaline filter which includes detoxification, reducing lactic acids, liver and kidney support, and toxic metal elimination.

The fourth minerals in the lineup are the mineral stones which equally aid in activating water molecules within the body cells and blood to improve the blood circulation.

ORP balls are the last media in this filter and they further help to clean the RO water by reducing its Oxidant Reduction Potential which not only helps to maintain healthy body cells but also boosts metabolism and immune system.

In short, the Water Filter Tec filter is one of the best alkaline filters out there that offers a perfect blend of natural alkaline contents.

It will effectively balance the pH of your RO water and on top of that add all the essential mineral supplements into it and make it much tastier water than your regular RO water. You also get an all-around, anti-oxidation effect and more oxygen than in normal RO water.

The installation has also been simplified for you as the filter comes with quick connect fittings plus filter clips that make connection it quick and easy.

It uses ¼” fittings, so you will need a 3/8” adapter if your system uses 3/8” tubes. Depending on the quality of your source water, it can give you a service life of around 6 to 12 months or 4000L.

Things we like

  • Can increase the alkalinity of water
  • The service life of filter is 1,500 gallons
  • High flow rate is approximately 0.75 gallons per minute
  • Can staightforward installation

Things we don't like

  • The item does not come with instructions
  • Not mineralise water well and raise TDS level

Geekpure C-RO5-MF Alkaline Water Filter Cartridge

The sixth spot in our list is taken by the Geekpure C-RO5-MF mineral filter. This a pretty decent alkaline filter that’s built nothing but the work is intended for which is to balance the pH level of the water and add back essential minerals.

Key Features:
  • Easy to install with great instruction
  • Nice packaging and affordable price
  • Greatly increase the pH in water

Geekpure C-RO5-MF Alkaline Water Filter Cartridge Review

The sixth spot in our list is taken by the Geekpure C-RO5-MF mineral filter. This a pretty decent alkaline filter that’s built nothing but the work is intended for which is to balance the pH level of the water and add back essential minerals.

The C-RO5-MF is made up of bio-stones, silver-pregnated zeolite stones and coral sands which contain all the original minerals that are necessary to make the water taste better and have good alkalinity level.

The filter adds back calcium, potassium, magnesium, and sodium ions into the pure RO water which helps raise its pH value to a much better level.

As for the installation, this is a 10-inch long filter with a diameter measuring 2 inches, so it’s designed to fit any standard under-sink RO system. It has ¼” NPT inlet/outlet thread and can give you service for up to 6 months.

Things we like

  • Easy to install with great instruction
  • Nice packaging and affordable price
  • Greatly increase the pH in water
  • Compatible with almost standard sized 5 or 6 stage RO systems
  • Tested by WQA certification
  • Come with 30 days money back guarantee

Things we don't like

  • Poor water taste

Express Water Mineral PH Plus Alkaline Water Filter Cartridge

If you are after an alkaline filter that offers a comprehensive blend of mineralization media and material, then this Express Water FLTALKQ10 is a great alternative.

Key Features:
  • 5 mineralization stages to remove up to 99.99% contaminants
  • Enhances the pH levels of water
  • You only need to change filter 2 times a year

Express Water Mineral PH Plus Alkaline Water Filter Cartridge Review

If you are after an alkaline filter that offers a comprehensive blend of mineralization media and material, then this Express Water FLTALKQ10 is a great alternative.

The unit utilizes 5 stages of mineralization which consist of maifan stone, far infrared, calcite, alkaline, and mineral stone.

The alkaline rock raises the water’s alkalinity which helps neutralize acid and increase oxygen in the water. The calcite crystal is responsible for correcting the pH of the water and preventing metal absorption.

The far infrared adds zinc as well as other important trace elements into the water while the maifan stone restores back the ionically activated mineral content into your RO water which includes magnesium, calcium, dietary iron, and potassium.

These minerals equally help improve the pH of your RO water, so you get maximum mineralization and alkalization.

The fact that the minerals are ionically activated allows the RO water to effectively pick up more mineral content from the stones just like how natural springs add minerals to the water.

Installing the Express Water FLTALKQ10 is completely a breeze because it will perfectly fit in any under-sink RO system. It’s a standard-sized filter that’s compatible with all quick connect systems. You will need to get an installation kit including the fittings and brackets.

Based on your feed water quality, the filter can go up to 6 months, so it will give you the best value before replacement.

Things we like

  • 5 mineralization stages to remove up to 99.99% contaminants
  • Enhances the pH levels of water
  • You only need to change filter 2 times a year
  • Significantly increases in TDS level
  • Compatible with Culligan, 3M, Aqua-Pure, GE, APEC, Pentek,…
  • Complies with NSF / ANSI Standard 58

Things we don't like

  • Requires fittings and brackets for installation
  • Poor-quality drinking water

LiquaGen Alkaline KDF 55 Alkaline Water Filter Cartridge

The reasons we listed LiquaGen Alkaline KDF 55 Alkaline Water Filter Cartridge as one of the best Alkaline Water Filter Cartridges.

Key Features:
  • Very easy to install with connectors and clips
  • 6 mineralization stages for removing taste, odor, chlorine
  • Impressively long-lasting filter up to 25,000 gallons before replacement

LiquaGen Alkaline KDF 55 Alkaline Water Filter Cartridge Review

The reasons we listed LiquaGen Alkaline KDF 55 Alkaline Water Filter Cartridge as one of the best Alkaline Water Filter Cartridges.

Things we like

  • Very easy to install with connectors and clips
  • 6 mineralization stages for removing taste, odor, chlorine
  • Impressively long-lasting filter up to 25,000 gallons before replacement
  • Increases water pH level
  • Compatible with APEC Water Systems, iSpring, Express Water, 3M, Aqua-Pure,

Things we don't like

  • Quite pricey
  • Does not improve water taste and odor

Hydronix ICF-2512-ALK Alkaline Water Filter Cartridge

The reasons we listed Hydronix ICF-2512-ALK Alkaline Water Filter Cartridge as one of the best Alkaline Water Filter Cartridges.

Key Features:
  • Easy installation and maintenance
  • Up to 2,000 gallons before filter need to be changed
  • Can supply high-quality water taste

Hydronix ICF-2512-ALK Alkaline Water Filter Cartridge Review

The reasons we listed Hydronix ICF-2512-ALK Alkaline Water Filter Cartridge as one of the best Alkaline Water Filter Cartridges.

Things we like

  • Easy installation and maintenance
  • Up to 2,000 gallons before filter need to be changed
  • Can supply high-quality water taste
  • Compatible with most RO and drinking water systems
  • Tested by NSF certified

Things we don't like

  • Low alkaline ph levels

10 Best Alkaline Water Filter Cartridges In This Post

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Historical Price Chart

This is one-year-history price chart of the Best Alkaline Water Filter Cartridges.

Note: This price chart is provided for reference purpose only.

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