The 10 Best Under Sink Water Filters in 2021

Chris Starks
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The kitchen sink is an invaluable workhorse in the home. It serves several important functions including providing a place to wash the dishes, general cleanliness, and it can even be used to cook. However, one major drawback of the sink is that when you’re doing dishes, you have to turn on the faucet and when you turn on the faucet, mold and bacteria gets into the water as it goes down the sink drain.

Undoubtedly, there are several types of filtration systems available to help keep the quality and healthiness of your tap water up to par. However, by far one of the most effective types of filtration systems is one that is installed beneath the sink. It’s also one of the easiest and most affordable options for water purification available to the consumer.

There are three main things to consider when choosing an under sink water filter for your home: cost, installation time, and water purification. It’s important to find a cost effective solution. This means you should go with the option that removes the maximum amount of contaminants while costing the least amount of money.

As you may know, these kinds of systems don’t come cheap. Because of this, you’ll need to do some research on both prices and how much water is removed from the tap.

NameCategoryProduct
CuZn UC-200 Under Counter Water FilterBest OverallCuZn UC-200 Under Counter Water Filter
Filtrete Advanced Undersink Water Filtration SystemBudget PickFiltrete Advanced Undersink Water Filtration System
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter SystemUpgrade PickiSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System

1. CuZn UC-200 Under Counter Water Filter

Our rating: 9 / 10

CuZn UC-200 Under Counter Water Filter

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Pros:

  • Great customer service support
  • Lightweight and easy to install
  • Sleek design
  • 50,000 gallons capacity

Cons:

  • The filter becomes stiff when frozen
  • High water pressure can affect the faucet connections

If you are looking for a heavy duty filtering system for a house, then the CuZn UC200 is the one you need.

This 50,000 gallon water filtering system can fit under any kitchen sink. This is due to its slim design and smooth finish. This means you can easily install it without worrying about the costly plumbing and pipe problems.

The BPA free filter also makes it safe to use for both people and pets since no harmful carcinogenic materials will get into your water. This also makes it safe for your plants.

2. iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System

Our rating: 9 / 10

iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System

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Pros:

  • Comes with a control module with advanced LED
  • 6 stages of purification
  • High capacity
  • Durable filter components
  • Eco-friendly
  • Remineralizes
  • Easy to refill
  • Comes with a one-year warranty

Cons:

  • A little noisy
  • The flow of the water can be restricted in certain situations

If you live in a place afflicted with hard water, an under sink water filter is a must. This reverse osmosis drinking water filter comes with 6 stages of purification (more than any other product on the market!) and is built to produce no waste water.

The alkaline remineralization filter on this machine provides fresh tasting, high-quality water that helps keep dental bills low. It also comes with a control module with LED indicators that let you know when the filter needs refreshing.

You know you’re getting good water when you use the iSpring RCC7AK. It’s so pure that you won’t even have to boil it. This reverse osmosis machine comes with an ultra-filtration membrane and carbon block that removes bacteria, chemicals, and other impurities.

3. APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System

Our rating: 8 / 10

APEC WFS-1000 Super Capacity Premium Quality 3 Stage Under-Sink Water Filter System

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Pros:

  • High-capacity filter
  • Good filtering even when needs to process large amounts of water
  • Multiple stages: 3-stage
  • Easy to install, even for beginners.
  • Perfect for larger households and provides great tasting water.

When it comes to under sink water filters the APEC WFS-1000 is one of the best you can find to fit your home. This water filter system provides exceptionally good-quality water, whether used to treat large amounts of water or for everyday use. It features 2 filters, a sediment filter, and a carbon block water filter, plus an aluminized steel tank. This system is perfect for households of up to 4 people.

The three-stage process provides great-quality water, even with frequent use. This under-sink filter makes it easy for everyone in your family to enjoy healthy water for drinking, cooking, and even ice cubes.

This system is super easy to install, even for a complete beginner. It can be easily hooked up to your regular water line, making it simple to install.

4. Woder WD-S-8K-DC Water Filtration System

Our rating: 8 / 10

Woder WD-S-8K-DC Water Filtration System

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Pros:

  • Sanitary double O-ring connection that provides a leak proof filtration
  • Sturdy construction
  • Made from high quality resin
  • 100% lead free
  • Lifetime Warranty

Cons:

  • The installation may require a plumber
  • Air gap not included

And Hundreds of other Impurities^.

Woder is a brand that’s known for its high quality and high performance under sink water filters they managed to create a new product in the line with the specific purpose of providing pure drinking water at an affordable price.

The water filter provides 0.01 micron filtration of water, which is way better than the standard 1-2 microns you get from faucet filters. In comparison with other filters, this is almost 40 times better filtration.

5. Frizzlife Under Sink Water Filter System-High Capacity Direct Connect Under Counter Drinking Water Filtration System-0.5 Micron Quick Change Removes 99.99% Lead

Our rating: 8 / 10

Frizzlife Under Sink Water Filter System-High Capacity Direct Connect Under Counter Drinking Water Filtration System-0.5 Micron Quick Change Removes 99.99% Lead

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Pros:

  • Affordable
  • Long lasting
  • Replacement filter is easy to find and cheaper
  • Great for ice makers

Cons:

  • Prone to leaks
  • Tough to clean
  • Installation can be complicated
  • Reverse osmosis effectively kills beneficial microorganisms

For many of us, it is impossible to imagine life without a kitchen sink under the counter. However, under-sink water filter systems are a solution that not only supplies clean water to the kitchen but also to the whole house, so it’s important to get a durable and efficient filter.

The Frizzlife under-sink water filter system is a powerful 0.5 micron membrane system that can remove up to 99.99% of impurities from your water.

Being a counter-top filter, it is much easier to install than traditional under-sink filters. The system locks right into the sink without requiring much effort. The sleek design makes sure that it doesn’t clash with your kitchen.

6. 3M Aqua-Pure Under Sink Full Flow Drinking Water Filter System 3MFF100

Our rating: 8 / 10

3M Aqua-Pure Under Sink Full Flow Drinking Water Filter System 3MFF100

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Pros:

  • Can filter hundreds of gallons of water ensuring your drinking water is safe and tastes good
  • Save tons of money on bottled water
  • Provides better-tasting water than a typical sink all-in-one filter
  • No plumbers necessary, quick and easy installation. No plumbing or additional connections required
  • Effortless filter change; just a twist and the new filter is in
  • 100% automatic and maintenance free
  • No electricity or batteries required

Cons:

  • A little expensive but you'll save a lot of money in the long run
  • The filtering process takes a little bit longer than other filters
  • Maximum flow rate is 1.6 gpm

Aqua-Pure drinking water filtration systems are one of the most popular in the market today. It’s probably the best under sink water filter for people who want to enjoy the best tasting and safest water possible.

Its full flow system filters water from the working sink line and delivers it to the faucet. It’s the perfect filter for small offices, studios, apartments and condos with up to 9 people.

7. Aquasana 3-Stage Under Sink Water Filter System

Our rating: 7 / 10

Aquasana 3-Stage Under Sink Water Filter System

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Pros:

  • Easy installation and use
  • Long-lasting filter cartridge
  • Solid build quality
  • Great customer support

Cons:

  • No in-line meter
  • Manual hour meter

The AquaSana under sink water filter is a great option for those who want to put an end to bad tasting water and odor. The system comes in a set of 2 and has a unique Claryum filtration system that reduces chlorine, which can lead to health problems. There are also claims that in-home chloramines may cause respiratory issues. This is a three-stage system with galvanized steel filters that include KDF and Carbon filters that trap chloramines, chlorine, lead, odors, dirt, and other impurities.

The system comes with a Quick Connect/Quick Connect tube kit that is easy to use. It also has an in-line meter that comes with a manual hour meter and a process indicator. The filter cartridge comes with an automatic self-regenerating system. This system is responsible for quick flow filtration instead of slow flow filtration. This helps to keep a steady flow of water in the home.

The system has a small upfront cost, but it will save you money in the long run. For one, there is no need to pay for bottled or filtered water; the under sink water filter set will clean your tap water for a fraction of the cost.

8. Filtrete Advanced Undersink Water Filtration System

Our rating: 7 / 10

Filtrete Advanced Undersink Water Filtration System

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Pros:

  • Fits right under the kitchen sink
  • Quick and easy installation
  • Easy to use and clean
  • UL listed
  • Solid 5-year limited warranty
  • Filter comes out for replacement in minutes
  • Leak-free connection

Cons:

  • No replacement filters available directly from this manufacturer
  • Slight audible hissing noise when plugged in

The Filtrete Undersink Water Filter System is an entry level product that delivers excellent filtration for a low price. It can be installed in an existing sink or new under-sink sink if you are doing a remodel, and it’s easy to remove for replacement and quick installation.

It filters out 67 gallons of water per day and you can use it to filter well or municipal tap water. Its carbon block filter will make cleaner, healthier drinking water in an instant. Compared to other best under sink water filters, this one is relatively noise-free.

It is a multi-stage filter that reduces carbon taint and odors, as well as sediment and bad taste in the water. It avoids lead in 10 micron size water but lead above 10 micrometers will pass right through the system.

9. AO Smith 2-Stage Under Sink Clean Water Faucet Filter

Our rating: 7 / 10

AO Smith 2-Stage Under Sink Clean Water Faucet Filter

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Pros:

  • High capacity:4000 gallons
  • Its size makes it ideal for multi-person households
  • Five-micron post carbon filter
  • Efficient in reducing sediments and chlorine
  • Made in the United States
  • Protective coating prevents filter from clogging

Cons:

  • The filters are quite large, and you will need to expand the faucet size to make room for it
  • Replacements are quite expensive

Looking for a good quality under sink water filter? Well, then you might consider the AO Smith brand. Unlike other water filters that cover one area of the water filtering process, it eliminates them all and does this with quality.

Installation is very easy and fitting it under the sink is a breeze. This does add space to your current setup, but at the end of the day, the water you get is perfectly filtered to the quality you get after it passes through this filter.

The water filter is NSF certified and this means you get quality guaranteed when buying this water filter. This is a 2-stage filter made with a 5-micron carbon block that removes sediments and chemicals from the water. In the second stage, the water passes through a four-micron post carbon filter that ensures the water is chlorine and other chemicals free.

10. Doulton W9330958 SuperCarb Under Sink Filter System

Our rating: 5 / 10

Doulton W9330958 SuperCarb Under Sink Filter System

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Pros:

  • Very effective, long-term filtration at a fraction of the cost of bottled water
  • Filters should last up to 6 years
  • Extremely easy to install

Cons:

  • Might experience some issues with installation if using an undersink mounted faucet
  • Installation will definitely require a professional if you have never done any plumbing before

If you’re searching for the best under sink water filters, then the Doulton SuperCarb is an excellent choice. This filter would fall within our top recommended (and reputable) brands as it is Consistent and high quality.

This filter is capable of reducing contaminants to levels you will be unable to detect with your senses. The filter will also protect you from harmful poisons and reduce the number of minerals like lead that are in your water.

This filter can be installed by the average person and does not require any additional tools or equipment (however if you are in doubt, you should probably contact a professional).

Frequently Asked Questions (FAQ)

What are the best under sink water filters?

The best under sink water filters are those that provide you clean, healthy, and fresh water that your family can enjoy all day, every day. With these, the water stays cold and refreshing. Best of all, you don't even have to lift a finger!

Here's what we recommend:

If you want a healthy, filtered, and refreshing glass of water every morning, this is the water filter you should have in your kitchen.

Are under sink water filters any good?

Having an under-sink water filter at home is a great option for those who prefer filtered water, but don't want to deal with the hassle of having it delivered to their homes as a subscription service. The best part is that these machines are basically maintenance-free. For around one hundred dollars or less, buyers can have an excellent water filtration system for the long-term.

Other options for having filtered water at home includes having your water line connected to a specific water filter or a water. Not only do you have a lot of different filter options, but you also can take advantage of replaceable filters which can cut down on future cost.

One of the downsides of under sink water filters is that some varieties are a little big and may take up a good deal of counter space. Though most models come with an optional faucet (which makes it easier to use), you'll still need to store it somewhere in the kitchen.

How do I choose an under sink water filter?

Just as each house has its own structural and architectural needs, each family has its own taste and preferences when it comes to water. In our opinion, choosing an under sink water filter is a lot like choosing a washing machine. If you're washing clothes every day, then you want a more efficient, higher capacity machine. But if you wash clothes less often, then an energy efficient model would be a wiser choice.

The same principle can be applied when it comes to choosing an under sink water filter. If you acquire contaminated water frequently or if you need filtered water for large pots or showering, then an entire house water filtration solution might be the right choice. However, if your filtered water needs are small, then an under sink water filter might be very cost effective.

According to our research, the main things to consider when it comes to the type of filtration system you choose are as follows:

How long do under sink water filters last?

Most manufacturers claim that their filters can process up to 6,000 gallons of water before needing to be replaced. However, this is under ideal conditions and not your actual usage. In reality, you might get more or less.

When it comes to longevity, there are a few other things to consider. What is it made of? How dirty is the water getting filtered? What is the water quality in your area? All these things can impact how long it lasts. Among the five brands we recommend you consider, the general recommendation is to replace the filter after six months. Our own recommendation is to replace it at least every six months or after a year (no matter how much they cost).

Conclusion

If you’re reading this article, at any given moment, you might be sitting in your kitchen, gazing out the bathroom window, and listening to the gurgle of water as it drains down your sink. The average person does not give a second thought to the water that he or she uses and flushes away each day. I could be watching the water swirling down the drain and I just take it for granted…

Our Recommendation

NameCategoryProduct
CuZn UC-200 Under Counter Water FilterBest OverallCuZn UC-200 Under Counter Water Filter
Filtrete Advanced Undersink Water Filtration SystemBudget PickFiltrete Advanced Undersink Water Filtration System
iSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter SystemUpgrade PickiSpring RCC7AK 6-Stage Superb Taste High Capacity Under Sink Reverse Osmosis Drinking Water Filter System