5 Best Under Sink Water Filter for Well Water

You don’t wanna take risks with the water. If you don’t take care of your family and yourself, no one will. And clean water is not only crucial for health but also for your economic and personal life.

Hence, we didn’t take the price as the primary focus when choosing the products to review. We went for the best under sink water filter for well water. However, the market competition gave us some nice picks that ensure the maximum output from our money.

Try to understand everything we pointed out here. It will help you to be more aware of your water and the process you are treating it with.

Under Sink Water Filter

Reviews of the Best under Sink Water Filter

The products reviewed are all top of their game. Although some of these products give you a significantly higher value than others, all of them are best at their primary function: filtration.

Before moving on to the product details, let us have a quick look at the products’ fundamental features in the table below.

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 1.  Home Master TMAFC-ERP Artesian Full Contact Undersink Reverse Osmosis Water Filter System


This is not your ordinary filter. The advanced RO system uses a catalytic carbon pre-filter that separates micro-partials that even most other RO filters fail to do. So, any kind of harmful substances in the water like chloramines, heavy metals, TDSs, chlorine, and other harmful chemicals will never be a problem.

However, one of the artesian patents allows the filter to reduce the mineral deficiency by adding calcium and magnesium minerals. By naturally adding it in two different phases, the filter system prevents tank degradation and improves the taste by balancing the pH.

You will have 2000 gallons of filtering capacity, which should last you about a year or more. It is a modular filter design enabling you to dispose the whole filter yearly. Hence, it reduces sediment, microorganisms, and biofilm buildup.

The flow rate is nearly double than of most other RO filters. Moreover, water wastage is also 80% lower. The installation is easy, and the yearly filter replacement is also far straightforward. Here are the box contents you will have with the main water filter-

  • Storage tank
  • Drain saddle
  • Faucet with chrome finish
  • 3/8-inch feed-water adapter with shut off valve
  • RO adapter
  • Instruction manual

Lastly, this US-made product will also provide you a limited five-year warranty.

Here are the primary pros and cons of the Home Master TMAFC-ERP Water Filter

Home Master TMAFC-ERP Artesian


  • Catalytic carbon prefilters
  • Better water flow
  • Good taste
  • Low water wastage
  • Modular design
  • Quick and effortless filter changing
  • Limited five-year warranty
  • Made in the USA


  • A backboard would have been made the installation a lot easier

2. CuZn UC-200 Under Counter Water Filter – 50K Ultra High Capacity


The UC-200 from CuZu might be the most successful filter in the market. It is widely acclaimed by its users and has an excellent approval rating in all markets.

The primary reason might be that CuZu doesn’t make promises that it can’t keep. So, there will be areas where the filter doesn’t perform, but manufacturers made them dead clear. And it leaves a mark where it performs.

They also have an excellent customer service which makes sure that you can install and maintain your filter. So, no extra plumbing charges.

On top of that, they also have a 90-day money-back guarantee and a pro-rated five-year performance warranty.

You can’t ask for a better service..!

Now, let’s come to the filtration part.

The filter has two media packed inside a micro sediment membrane made with sand and undissolved particulates. Those two medias are acid washed coconut shell with activated carbon and KDF-55. The former targets organic contaminants and microbials along with bad odor and taste and the latter targets inorganic materials like heavy metal and lead.

But don’t use TDS or PPM to test the water as the filter doesn’t make the water soft, which is essentially dead water and bad for your health. You can use chlorine test strips. Moreover, the filter is also immune to bacteria and mold.

Here are the primary pros and cons of the CuZn UC-200 Water Filter

CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity


  • Excellent customer service
  • 90-day guarantee and five year warranty
  • Includes all instruments
  • Excellent filtering
  • Made in the USA


  • Can’t be used for private well water

3. iSpring RCC7AK 6-Stage Under Sink Reverse Osmosis Drinking Water Filter System


The RCC7AK has the most sophisticated filtration system. It definitely serves you more than you pay for it.

It has a six-stage RO filter. But before that, there are three pre-filters. They are-

  • PP sediment filter
  • Drain saddle
  • Carbon block filter

These filters separate the large particles. They are in transparent housing, so you will know the time to change them.

After these three layers, the water goes to the RO membrane that filters the water to the molecular level measuring down to 0.0001 microns. So, lead, chlorine, chloramines, arsenic, fluoride, mercury, sodium, and virtually nothing can go into the water.

However, the filter remineralizes the water in the 6th stage of the RO membrane to keep a natural alkaline balance. This process retains the health benefits and taste of the water.

Here are some more information given by the manufacturers-

  • Water Pressure: 45 PSI – 70 PSI
  • Operating water temperature range: 40 – 100 °F
  • Maximum TDS: 750 ppm

We also had the following contents with the filter-

  • 2.5-gallon pressurized storage tank
  • Lead-free brushed nickel faucet
  • Drain saddle
  • Water detector
  • 4-color tubing
  • Spare fittings
  • O-rings
  • Feed water adapter

The installation process was also easy to DIY. And the customer service line is always there to serve you. They have given a lifetime personalized support guaranty. But do not take that as a warranty, because there isn’t one.

Here are the primary pros and cons of the iSpring RCC7AK Water Filter


  • Three pre-filters
  • Six stage RO filter
  • Filters down to .0001 microns
  • Remineralization
  • All installation material included
  • Excellent customer service
  • Best filter for the money


  • The O-rings supplied are not very good
  • Increased water wastage

4. APEC Water Systems RO-90 Ultimate Series Reverse Osmosis Drinking Water Filter System

This water purification system is a reliable source that fits in your budget. This US-made product is said to be developed for the regions which suffer from prolonged water contamination. Hence, it is durable more than anything.

The filter also has a certification from WQA. And that’s a big relief as they are bound by the law to certify only the filters that can remove 99% of the water’s contaminants.

Pertaining to the contamination zone specialist target, the filter can work with twice the speed. Moreover, you will also have the following components with the man filter-

  • Lead-free designer faucet
  • JG food grade tubing
  • JG quick connect fittings

The fittings are really good, and they almost never cause leakage.

Again, the filter will easily pass 12 months for a general American family. At the time of filter replacement, you will find it very easy to pursue the change.

Lastly, there will be lifetime support and two years of warranty from the manufacturer with registration.

Here are the primary pros and cons of the APEC Water Systems RO-90 Water Filter


  • Filter lasts a long time
  • Budget-friendly
  • WQA certified
  • US-made product
  • Filters 2x faster
  • Two-year warranty
  • Premium quality fittings


  • The flow rate is a little slower

5. Home Master TMHP-L Hydroperfection Loaded Undersink Reverse Osmosis Water Filter System

We included this last one for those who want to enjoy a little luxury in their kitchen. But before moving on to the extravagant part, let us evaluate its primary function: filtering.

Much like our first Home Master product, it also has a modular design. This design ensures maximum flexibility. This also lengthens the life of the filter as well as ease of filter replacement. And you will need to change it after two thousand gallons, which is roughly a year of water supply.

With the slightly increased price, you can get a nine-stage filtration system. Firstly, an advanced redox media KDF85 iron pre-filter protects the RO membrane from large debris. Secondly, you will have catalytic carbon pre-filter, which is mixed with other media. And the third is a sediment filter.

After these three, you will have the five-layer RO filter, which filters the water at a molecular level. Lastly, there is a unique ultraviolet light filter that is the best filtration process, according to the EPA. So, you are dealing with the most advanced filtration technology here.

However, to make the taste greater, there is a remineralization process in the filter.

Lastly, there is also a five-year limited warranty. For the price, this is a very good deal.

Here are the primary pros and cons of the Home Master TMHP-L Water Filter

Home Master TMHP-L Hydroperfection Loaded Undersink Reverse Osmosis Water Filter System


  • Modular design
  • Push-in fittings
  • Nine stage filter
  • UV light filtration
  • Remineralization
  • Great taste
  • Faster flow rate
  • Better water efficiency
  • Approved by NSF and EPA
  • Five years limited warranty


  • A bit pricy. Although it fits the market.

Under Sink Water Filter Buying Guide

Here are a few facts that are essential when choosing an under sink water filter. Take the attributes as a checklist and go through them when you are getting your new under sink water filter.


You might not be thinking of money when it comes to water purification. However, you can find better deals for the same amount. So, if you have the time, you can research the best value for your money. Otherwise, you can just pick one from the list.

Filtration process

Under Sink Water Filter Filtration processOur list shows that we support the Reverse Osmosis (RO) water filtration process. However, general multistage media filters are also useful for certain applications. Nevertheless, you have to be careful about the type and quality of media.

Filtration stages

Under Sink Water Filter Filtration stagesA RO membrane should have more than four layers. Five is the average. And the RO comes with some pre-filters. Commonly, there are two or three pre-filters. That will give you a seven or eight stage water filter. There can be some additional filters like UV light.

Filtration media

RO filters and media filters all have more or less filter medias. The best quality medias are-

  • Catalytic carbon
  • KDF-55
  • KDF85
  • Coconut shell carbon media PP sediment filter
  • Carbon block filter
  • Sediment filter
  • Regular filters are not very efficient with molecular filtration.
  • Remineralization and water taste

Demineralized water tastes horrible. It can also react with your storage tank and other plastics to product a very bad stench. Heavy metals and other chemicals on the inside of the storage facility can leak out to the water.

To prevent it filters naturally add some minerals like magnesium to better the taste. It also prevents the reactive nature of the water.

Filter installation and replacement process

Filter installation and replacement process

The installation shouldn’t take a plumber to complete. Make sure you have the right measurements and have the correct tools. The filter’s capacity should be around the 2000 gallons mark so that it can last a year.

And that means you will be changing the filter, not more than once a year. Finding the replacement and its price should not be too high.

How to install an Aquasana AQ-5200 under counter drinking water filter system


Many organizations, like NSF or EPA, certifies filters. The government certifies many processes. They test water for heavy metals like lead and microorganisms. A certification from them is a big plus for the water filter.

Warranty and customer support

Most filter companies at least show confidence for a year of warranty. However, that is not a rule of thumb. Whatever the warranty is, the water filter consumer support has to be great. They should be offering easy replacements and online support for the lifetime of their products.


When it comes to health, you don’t wanna compromise. And water is as important as it gets. So, you want the absolute best under sink water filter for well water.

And you will hardly find a better deal in terms of price than the ones we have mentioned on our list. So, stop living in uncertainty on your water. Find one yourself or pick one from the list.

Don’t wait for your health to bad.

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