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It is expected that when you drink water from the tap in your home that you are getting clean water and that it’s safe.

Until recently, drinking water from that flows freely into your home has been a privilege that most enjoy without having to worry about consequences. However, that isn’t the case anymore.

Now, you cannot be sure that what you're drinking from your home is going to be clean and healthy.

The bad news about your home tap water is that it has the potential to come with contaminants that can cause real health issues.

The good news is, under sink filtration systems are becoming more popular - they provide you with cleaner water that is safe for the whole family. The main reason for their popularity is that they are easier to install than other filtration systems, and they do not produce wastewater the way other systems would. 

We’ve done the research to help you find the best under sink water filter system this 2020 for your home, with help of this useful buying guide.

In a Rush?

CuZn UC-200 50K Ultra High Capacity - Made in USA


CuZn UC-200

  • Amazing 50,000 gal Capacity
  • Hassle-Free Installation
  • Superb water purification without removing its minerals beneficial for health
  • 5-Year Warranty and 90-day satisfaction guarantee and Made In USA
  • Most Affordable with Maximum Benefits

How we conducted the test:

We got a team of evaluators and tried a number of products from different brands to see which will give peak performances according to specific purposes. We also logged in the number of hours that we spent in testing the models.




Top Choices on the Market




CuZn UC-200

CuZn UC-200



  • Superior UnderSink Water Filter System
  • 5-Year Warranty
  • Capacity: 50,000 gal or 5years


  • 4.5 x 4.5 x 15 inches
  • Item Weight: 8 pounds

iSpring 6-Stage Reverse Osmosis

iSpring 6-StageReverse Osmosis


  • 6-Stage Filtration System
  • Reverse Osmosis Technology
  • Alkaline Remineralization


  • 14.5 x 6 x 17 inches
  • Item Weight: 20 pounds

Woder 10K-Gen3

Woder 10K-Gen3


  • Selective Filtration Technology
  • Capacity of 10,000 gal or 3 years
  • 99.9% contaminant Removal Power


  • 3 x 3 x 15 inches
  • Item Weight: 2.91 pounds

Culligan US EZ-Change

Culligan US EZ-Change


  • Twist On, Twist Off Mechanism
  • Filter Life Indicator
  • 2-year Limited Warranty


  • 14.2 x 9.2 x 8.4 inches
  • Item Weight: 4.05 pounds

Aquasana 3-Stage Max Flow

Aquasana 3-Stage Max Flow


  • Claryum Selective Filtration Technology
  • Capacity 800 gal
  • 1-Year Warranty with 90-Day Guarantee


  • 4.2 x 12 x 12.9 inches
  • Item Weight: 7 pounds

Whirlpool WHAROS5 Reverse Osmosis (RO)

Whirlpool WHAROS5 Reverse Osmosis (RO)


  • EZ-Change Light Indicators
  • 6 Months Filter Life
  • 1 year Factory Warranty


  • 13.2 x 15 x 13.2 inches
  • Item Weight: 13.2 pounds

3M Aqua-Pure

3M Aqua-Pure


  • 3-Stage Carbon-Block Filtration
  • Sanitary Quick Change
  • Filter Life of 1-Year or 6,000 Gal


  • 22.5 x 4.9 x 4.7 inches
  • Item Weight: 4 pounds

GE Under Counter Dual Flow

GE Under Counter Dual Flow


  • Twist and Lock System
  • Dual Flow Filtration Technology
  • LED Filter Life Indicator


  • 4.5 x 7 x 12 inches
  • Item Weight: 4 pounds

Best Under Sink Water Filter Reviews (Updated 2020)

CuZn UC-200 Under Counter Water Filter - 50K Ultra High Capacity - Made in USA
  • Filter Capacity of 50,000 gal
  • Hassle-free installation process
  • Superb purification without removing its minerals beneficial for health
  • Made in USA

1. CuZn UC-200 Under Counter Water Filter
50K Ultra High Capacity - Made in USA 

1.5 GPM
Flow Rate

Filter Life: 
up to 5 years of Usage

Filtration Technology: 
Bacteriostatic Filtration System

This under-sink water filter system is a top-rated product because it doesn’t need additional faucets and it’s incredibly easy to install. You will notice immediate the quality improvements on the taste and odor. The design is simple and compact. You need only five minutes of your time to install this as it connects quickly to your cold water line.

What we like:

  • Noticeably reduces contaminants
  • Helps make water tastier
  • Easy to install
  • Does not reduce flow rate
  • Comes with a five-year pro-rated warranty

What we don’t like:

  • This unit was not designed to remove TDS (Total Dissolved Solids)

If you are wanting a top-rated water filter system that fits under your sink and can be installed in minimal time, the CuZu UC-200 Under Sink Water Filter is the one you want to get. From the sleek, simple design to the result of better water quality makes this filter system the best one on the market.

iSpring RCC7AK 6-Stage Superb Taste High Capacity Reverse Osmosis Drinking System with Alkaline Remineralization - Natural pH
  • Capacity of 75gal per day
  • Easy Installation, with design that fits perfectly under a standard kitchen sink
  • Alkaline Remineralization restores minerals and makes a balanced alkalinity which is beneficial to health
  • 6-Stage Filtration 
  • Removes almost 99% of over a thousand contaminants

2. iSpring RCC7AK 6-Stage
High Capacity Under Sink Reverse Osmosis Drinking Water Filter System with Alkaline Remineralization - Natural pH

3.5 GPM
Flow Rate

Filter Life: 
up to 2-3 years of Usage

Filtration Technology: 
Reverse Osmosis with Alkaline Remineralization

This under-sink water filter system comes with a multi-stage filtration technology that is also remineralization and has passed many rigorous tests to prove that it’s among the best under skin filtration systems in today's market.

The 5-stage filter ensures that the water you get will be significantly purified. This filter is so good it does not remove only contaminants but necessary minerals.

For this reason, the remineralization of Ca+ and Mg+ are reintroduced and provides you the water that you are seeking when you go for a clenching glass.

What we like:

  • Comes with a lead-free brass faucet
  • It is affordable
  • Removes up to 98% of contaminants
  • Easy installation

What we don’t like:

  • The unit is heavy
  • It does impact your flow rate slightly

All in all, this  is a great choice - while it’s heavy and takes a bit of time to install, the installation process is actually quote simple. Once set and you allow for the specialized time of water flow, you will experience clean and clear water that will have lower TDS than some bottled water you can buy.

  • Capacity of 10000 gal of usage
  • Crystal clear safe and better-tasting water on every drop
  • Removes impurities and contaminants while retaining all the healthy minerals
  • ready-to-use in five minutes

3. Woder WD-S-8K-DC - WQA Certified – 
USA Made Ultra High Capacity Direct Connect Under Sink Water Filter

Flow Rate

Filter Life: 
up to 3 years of Usage

Filtration Technology: 
Selective Filtration

This filtration system is very effective, considering its relatively lower price compared to other models.

The installation is as simple, as everything you will need comes with the system. The filters rarely need to be changed as they are good for up to three years. So it’s pretty easy to get healthy, clean water for your family to enjoy in a few easy steps!

What we like:

  • Long-lasting filters
  • Easy installation
  • Good price
  • Remove the majority of contaminants

What we don’t like:

  • Slowed water pressure
  • Installation is a bit more difficult for those with older homes

When looking for a good budget water filtration system that you can easily hide under your sink, then the WODER 10k-Gen3 is the ideal under sink filter. Installation is simple unless you have an older home, and the filters last up to three years, which is a considerable amount of time comparably. Most importantly, you get clean water that tastes good and is mostly free from contaminants.

Culligan US-EZ-4 EZ-Change with Dedicated Faucet, Premium 500 Gallon Included
  • turns tap water into great-tasting and Safe to drink
  • Easy fitting with installation hardware included
  • Easier to know when to change filter with the aid of LED filter life indicator
  • 2-year limited warranty

4. Culligan US-EZ-4 EZ-Change Undersink Drinking Water Filtration System
with Dedicated Faucet, Premium 500 Gallon Filter Included

.5 GPM
Flow Rate

Filter Life: 
up to 6 months of Usage

Filtration Technology: 
Twist on/off filter mechanism

This under-sink filtration system includes a faucet meant to be used with it. The filter cartridge itself is easy to change and the entire unit is easy to install.

You can quickly install fitting with a quick twist on and off. Using this filter, you can reduce the smell of odors, remove most contaminants, and enjoy clean and clear water.

What we like:

  • Filters are easy to change and inexpensive
  • Replacement parts will not make a big dent in your wallet
  • Removes up to 98% of all contaminants
  • Simple installation

What we don’t like:

  • The plastic parts aren’t all that durable
  • You may need additional parts for installation than what is provided

For an inexpensive and effective under sink water filter, the Culligan US is the one you want. You will have clean and clear water that is free from contaminants and that tastes delicious. As a huge plus, you won’t have to spend a great deal of time installing this unit.

Aquasana AQ-5300+.55 3-Stage Max Flow
  • Designed for easy fitting and engineered for simple filter replacement
  • preserves the minerals like calcium, potassium, and magnesium beneficial to health while filtering contaminants
  • Reduces contaminants of 77 kinds up to 99%
  • 1-year warranty and 90-day guarantee

5. Aquasana AQ-5300+.55 3-Stage Max Flow

.75 GPM
Flow Rate

Filter Life: 
up to 800 gal of water Usage

Filtration Technology: 
Claryum Selective

The Aquasana helps to transform nasty tap water into clean water that is 99% cleaner than before. This unit is both cost-efficient and long-lasting, as it will filter your water for less than 10 cents a gallon.

Its filters are inexpensive to purchase and simple to change. This unit is designed with only top quality parts for a filtration system you can enjoy for years.

What we like:

  • Great tasting water
  • Filters out 99% of water contaminants
  • Installing is very simple with clear instructions
  • Excellent customer support

What we don’t like:

  • The Bluetooth feature is more of a gimmick
  • Your water flow rate will slow down

This filter system works and does a great job of cleaning your water. You will be able to enjoy crisp water once you get it out of the faucet as it does slow the flow rate. However, installation is a breeze, and if you have any issues, the Aquasana customer service will save the day.

  • Reduces contaminants like chlorine, lead, microbial cyst, and other harmful contaminants
  • Easier installation and filter replacement 
  • EZ-Change indicator light alerts you when to change filter
  • 1-Year Factory Warranty
  • Proudly Designed and Made in USA

6. Whirlpool WHAROS5 Reverse Osmosis (RO) Water Filtration System With Chrome Faucet & Easy To Replace UltraEase Filter Cartridges

.75 GPM
Flow Rate

Filter Life: 
up to 6 months of water Usage

Filtration Technology: 
Reverse Osmosis (RO)

Using an advanced reverse osmosis system, the Whirlpool WHAROS5 will provide you with safer water. Remove up to 15 contaminants from your home and get fresher water that is odor-free and tastes much better. There is an indicator light that lets you know when the filter needs to be changed, and you can do so in seconds without turning off your water. Furthermore, this system is easy to install.

What we like:

  • Easy to install Under Sink Filter
  • Faucet is modern and contemporary
  • LED indicator light when the filter needs changing
  • Simple filter change

What we don’t like:

  • Parts are all plastic
  • Impacts water flow rate

Using this under-sink water filter system, you will get clean and clear water that is delicious and free from contaminants. The only real issue you may experience with this unit is the hookup parts are plastic, and you may want to change them out for brass. However, the system  is easy to install, and the modern faucet will suit most households. Overall, a good unit for any home.

3M Aqua-Pure Under Counter Full Flow Drinking System 3MFF100
  • Up to 6000 gal capacity
  • built-in shut-off valve for easier filter replacement 
  • universal system design allows use for municipal and well water sources
  • reduces particulates like lead and parasitic protozoans and improves taste of water 

7. 3M Aqua-Pure Under Counter Full Flow Drinking System 3MFF100

2.5 GPM
Flow Rate

Filter Life: 
up to 12 months of water Usage

Filtration Technology: 
3-Stage Carbon-Block Filtration

Having an under-sink filter system like this one gives you cleaner water than you have ever had. The installation is a breeze, and changing the filters is quick and easy without having to turn off the water using the built-in shut-off.

 Using this filtration system allows you to have almost full flow as the water passes through the triple stage filtration process that gives you clearer and tastier water that is free from odors.

What we like:

  • Easy installation
  • Built-in shut off for filter changes
  • Excellent water taste
  • Removes up to 98% of contaminants

What we don’t like:

  • Having to purchase fittings versus water lines that are already crimped
  • The instructions for installation are more complicated than the installation itself

The 3M Aqua-Pure under sink water filter is an excellent choice for most households. Seeing as the only real issue is with installation parts, this product is among the top. You will love how excellent the water tastes and how easy it is to conduct filter changes. When looking for an under sink filter that does not impact your water flow significantly, this is the one you want.

GE GXK285JBL Twist And Lock
  • Up to 300 gal capacity
  • components made from engineered carbon for ensured high reliability
  • Easy installation and replacement with twist and lock style
  • 1-year limited warranty
  • with LED filter life indicator

8. GE GXK285JBL Twist And Lock

1.1 GPM
Flow Rate

Filter Life: 
up to 6 months of water Usage

Filtration Technology: 
Dual Flow System

This water filter is an NSF certified unit that will reduce up to 14 contaminants that you will find in your home water.It will also reduce up to 97% of the chlorine in your drinking water.

The filter is good for about 300 gallons before needing to be changed. You will have cleaner water, and that is tastier and free from odors. Moreover, the twist and lock design helps provide easy filter changes along with easy installation.

What we like:

  • Easy to install
  • Good flow rate
  • Removes up to 98% of contaminants
  • Filter changing is easy

What we don’t like:

  • You need to purchase brass fittings to replace the plastic ones
  • The control knob is plastic and costs upward of $50 for replacement

The GE GXK285JBL under sink filter is a good choice for anyone wanting to have clean and clear water. By reducing the majority of contaminants as well as chlorine, you know you are getting safe water for cooking and consumption. The unit is easy to install and provides a good water flow rate as compared to others.

How to Pick the Perfect One For Your Needs

Knowing which are the top-rated under sink water filters is one thing, picking the right one for you is another. Have a look at some key things to look for when choosing your under sink water filter.

Features to Look For

Water Pressure – With all water filters, the pressure of the water is important. Getting a water filter that is capable of giving you decent water pressure is important so that you aren’t waiting forever for a glass of water.

Filtering – Some filters might be more efficient than others, depending on their components. A kit will show you which contaminants are higher in your home water source, and you can use this information to pick the right under sink water filter.

Ease of Installation and Filter Changes – Another important feature to look for is how easy the unit will be to install and, likewise, how easy are the filters to change. If you are not a licensed plumber, you want to be sure that you choose a unit that anyone can install. Furthermore, filter changes that take less than 10 minutes are ideal.


Along with the features, there are a few things you want to consider before purchasing an under sink water filter.

You are alright with the filtered water only coming from one source and not through your entire home water system.

The amount of space you have under your sink is another consideration. If that space is limited, do you have basement access?

You live in an area that is prone to contaminated water or has poor water quality leading to your home. Does your water smell of chlorine or look cloudy at times?

Does your sink allow for an extra faucet, or can you replace an existing one?

How to Install

Installation should be straight forward with these units. Therefore, the steps outlined should work for most models.

  1. Remove current tubing from under the sink
  2. Clearly mark where you want the new filter to go
  3. Make all the plumbing connections first
  4. Add the filter and connect it to the sink
  5. Mount the filter in the marked location
  6. Test your new filter out

Note: The manufacturer will include information in the manual on how to install and how to test the water. Some units may require a bit of time running the water continuously before it is safe to use.

How to Replace or Change

The way you change or replace the filter will be subjective of the unit you own. However, here are some general guidelines.

  • Turn the water off
  • Open your faucet to allow water to drain out
  • Using the necessary tool, open the casing
  • Remove filter
  • Clean the inside of the casing
  • Replace filter
  • Close the casing
  • Check for leaks when you turn the water back on

Note: The manufacturer will provide you information on how to change the filter, you should adhere to this information. Additionally, all filters associated with the unit should be changed at the same time, no matter how they look.

Common Problems and Fixes

There are always problems and issues that you are going to encounter with any device you have in your home. An under sink water filter is no different. Here are a couple of common problems and the fix.

A sudden drop in water flow rates

Solution: Often, when the water pressure changes, it is because of a filter issue. Either you have overused the filter, or the filter is clogged. When this happens, you want to replace the old filter cartridges with a new one. More often than not, you will find that the water pressure will stabilize.

Leaking in the under sink filter connections

Solution: Check that there are no cracks in the tubing. If the leak is coming from a fitting, using Teflon tape may help the issue. Moreover, if you have plastic fittings, replace them with brass fittings.

Final Verdict

CuZn UC-200


Under sink water filters are ideal for any household. You want to get the best one for your money so that you are not going to have to deal with a slew of problems.

The best under sink water filter you can purchase is the CuZn UC-200 Under Counter Water Filter. This unit barely affects your water pressure, and it provides crystal clear water that is safe for cooking and drinking. However, if that unit doesn’t meet all your requirements, then the GE GXK285JBL and the  Aquasana AQ-5300+.55 are also excellent choices.

With so many issues with residential water arising in recent years, it is in your best interest to invest in an under sink water filter. The top-rated under sink water filters will clean out up to 98% or more contaminants, which ensures good water quality. You don’t want to wait, start enjoying safe water today.

Comparison Chart

1CuZn UC-200
9.8Buy on Amazon
2iSpring 6-Stage Reverse Osmosis Drinking
9.7Buy on Amazon
3Woder 10K-Gen3
9.3Buy on Amazon
4Culligan US EZ-Change
9.2Buy on Amazon
5Aquasana 3-Stage Max Flow
8.8Buy on Amazon
6Whirlpool WHAROS5 Reverse Osmosis (RO)
8.6Buy on Amazon
73M Aqua-Pure
8.5Buy on Amazon
8GE Dual Flow
8.2Buy on Amazon