9 Best Under Sink Water Filters – Reviews and Buying Guide

It is a matter of concern if the water from your faucet or in your refrigerator tastes or smells bad. This might make you worry about the quality of water flowing through your house. If this is your story, then an under-sink water filter can be your best solution.

There are many advantages to having an under-sink water filter system at your home. It is effective in removing a wide range of harmful contaminants from the water. Additionally, the system is affordable, easy to install and maintain. Basically, you get clean and pure water straight from your faucet whenever you need, without any hassle.

Above all, these under-sink water filters take very little space on your kitchen counter, and most of them take only a little space underneath it.

Now that you have a basic idea of under-sink water filters, let us present you with a detailed review of the 9 best under-sink water filters of 2020. Besides the review, we have also included a comparison table, a buying guide, and answered a few FAQs in this article.

Our Top Pick

CuZn UC-200 Under Counter Water Filter

The under-sink water filters mentioned in this review are not only budget-friendly, but they also offer premium service for keeping household water clean and pure. Among the 9 products reviewed below, we rank CuZn UC-200 Under Counter Water Filter as the top product. This non-RO Under Sink water filter operates under a three-stage filtration system for keeping the municipal water safe from contaminants.

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Quick Summary of 9 Best Under Sink Water Filters in 2020

Image Under Sink Water Filters
Best non-RO Under Sink Filter for Municipal Water
CuZn UC-200 Under Counter Water Filter

A massive filtering capacity of 50,000 gallons makes this under sink water filter one of the most popular products in the market.

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Best Under Sink Filter for Well Water with UV Light
Home Master TMHP Under Sink Reverse Osmosis Filter System

This under sink water filter uses UV light for virus and bacteria removal from your house water. Plus, it includes an advanced purification and softening process.

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Efficient and Long-Lasting Under Sink Water Filter
Home Master TMAFC-ERP Under Sink Water Filter

This is a product known for its efficient performance as it consists of a built-in non-electric permeate pump that helps to minimize water waste. Plus, the system is very durable.

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Best Buy for Efficient Toxins Removal
APEC Top Tier Alkaline Mineral pH+ 6-Stage

This APEC’s under sink water filter performs in five different stages to provide you with clean and pure water in your household. The double carbon blocks of the system are capable of removing up to 99.99% chlorine.

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Multi-Usage Under Sink Water Filter with Auto Shut-Off Design
Frizzlife Under Sink Water Filter System

The Frizzlife Under Sink Water Filter System includes a two-stage water purifier that helps to keep your house water away from contaminants. Plus, it comes with an auto shut-off design for easy filter replacement.

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Top Quality Product with Efficient Remineralization Process
iSpring RCC7AK 6-Stage Drinking Water Filter System

This multi-staged under sink water filter system includes a remineralization process that helps to alkalize the water and bring more natural taste to it.

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Best Budget Under Sink Water Filter
Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter

WQA and NSF certified, this budget under sink water filter is capable of filtering around 10,000 gallons of water before filter replacement.

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Best Buy Four-Stage Under Sink Filtration System
AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink

AO Smith’s RO model operates under four-stage filtration system for removing 99% of harmful substances from the water.

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Eco-Friendly Under Sink Water Filter with High Flow Rate
Aquasana 3-Stage Under Counter Water Filter System

This is an eco-friendly under sink water filter system that goes through three-stage for purification while maintaining a high flow rate.

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Best Under Sink Water Filters in 2020 - Reviewed

CuZn UC-200 Under Counter Water Filter

Best non-RO Under Sink Filter for Municipal Water

Features Highlights

  • Massive capacity
  • Three-stage filtration process
  • Bacteriostatic filtration system
  • Fuss-free installation
  • Long filter life
If you are concerned about municipal water and looking for the best non-RO under sink filter to minimize the hassle, you should go for this CuZn UC-200 Under Counter Water Filter. Check Price on Amazon

Product Specification

  • Dimensions:

    4.5 X 4.5 X 15 inches

  • Weight:

    8 pounds

  • Capacity:

    50,000 gallons

Pros

  • Effectively reduces chlorine, sediments, lead and other contaminants
  • Improves water taste and odor
  • Easy installation
  • Lasts long
  • Good customer service

Cons

  • Not engineered to remove TDS
  • Won’t work with well water

Our Verdict

One thing you should note down before buying this under sink water filter is that it is designed for use with municipal water only. Never use the system with private well water, you won’t get the desired result.

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Home Master TMHP Under Sink Reverse Osmosis Filter System

Best Under Sink Filter with UV Light For Well Water

Features Highlights

  • Modular filter design
  • Advanced purification and softening process
  • Alkaline water
  • UV light
  • Faster flow rate
  • Great water efficiency
  • Durable
  • Easy maintenance
You will love this unique RO Under Sink filter system that uses UV light for destroying microorganisms that can be found in your household water. Check Price on Amazon

Product Specification

  • Dimensions:

    5 X 15 X 15 inches

  • Weight:

    18.75 pounds

  • Capacity:

    2000 gallons

Pros

  • Effective in removing iron, lead, chlorine, and other heavy metals
  • UV light for destroying microorganisms
  • Mineralization
  • Low waste to pure water ratio

Cons

  • High price
  • Requires electricity for UV light

Our Verdict

This Home Master TMHP Under Sink Reverse Osmosis Filter System is useful if you use well water. Its innovative design eliminates the most common issues found in traditional RO systems- canister filter housing leaks, slow flow rate, high water waste, and slightly acidic water.

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Home Master TMAFC-ERP Under Sink Water Filter

Efficient and Long-Lasting Under Sink Water Filter

Features Highlights

  • Better RO system
  • Built-in non-electric permeate pump
  • Improved flow rate
  • Incredibly low waste
  • Super effective water filtration
  • Innovative filter design
  • Easy installation
Best-known for its performance, this under sink water filter includes a built-in non-electric permeate pump that helps you with a reduction in water waste and an increase in water production. Check Price on Amazon

Product Specification

  • Dimensions:

    12 X 16 X 20 inches

  • Weight:

    14.5 pounds

  • Capacity:

    2000 gallons

Pros

  • Effective in removing contaminants
  • Low waste-water ratio
  • Fast flow rate
  • NSF listed
  • Innovative design

Cons

  • The loaded package is a bit pricey

Our Verdict

This Home Master under sink water filter comes with an innovative design that solves the most common problems associated with traditional RO systems. You can find up to 99% chemicals including chloramine and other contaminants removed with its multi-stage filtration system.

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APEC Top Tier Alkaline Mineral pH+ 6-Stage

Best Buy for Efficient Toxins Removal

Features Highlights

  • Supreme quality
  • 75 GPD 6-stage system
  • US-made cartridge
  • Ultra-safe pH+ alkaline re-mineralizing calcium filter
  • Efficient APEC carbon blocks
  • Easy installation and maintenance
If you are looking for an under-sink RO system that frees your water from toxins but retains the beneficial minerals, you should get this handy under-sink water filter. Check Price on Amazon

Product Specification

  • Dimensions:

    16 X 5.2 X 17.5 inches

  • Weight:

    25 pounds

  • Capacity:

    75 gallons per day

Pros

  • Mineralization for alkaline water
  • Significantly improves taste and odor
  • Efficiently removes contaminants
  • Ease of use

Cons

  • Higher waste to pure water ratio

Our Verdict

APEC Top Tier Alkaline Mineral pH+ 6-Stage is the best option if you are looking to improve the taste and odor of your household water without losing the essential minerals from it. With efficient performance, it is affordable and easy to operate.

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Frizzlife Under Sink Water Filter System

Multi-Usage Under Sink Water Filter with Auto Shut-Off Design

Features Highlights

  • Two-stage advanced system
  • High flow rate
  • Multiple uses
  • Money-saving
  • Environmental protection
  • Compatible with cold water line
Frizzlife Under Sink Water Filter System is the product for you if you love a filter that includes a multi-use feature and doesn’t take much gas out of you while setting up and maintaining. Check Price on Amazon

Product Specification

  • Dimensions:

    13.8 X 5.3 X 5.3 inches

  • Weight:

    4.5 pounds

  • Capacity:

    1,600 gallons

Pros

  • Removes 99.99% lead from water
  • Includes an auto shut-off design
  • Easy installation and replacement
  • Multi usage
  • Environment-friendly

Cons

  • Can’t use TDS meter with this model
  • Doesn’t remove copper from water

Our Verdict

The auto shut-off design is the key feature that makes this under sink water filter popular among the users. If the system stops working, all you need to do is replace the core filter cartridge rather than invest in an entirely new filtration system. The filter cartridge can last for around two years (i.e. roughly 1,600 gallons of water).

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iSpring RCC7AK 6-Stage Drinking Water Filter System

Top-Quality Product with Efficient Remineralization Process

Features Highlights

  • High capacity Reverse Osmosis (RO) water filtration
  • Multi-layered filter system
  • Pre-filter housings
  • Premium components
  • Easy do-it-yourself installation
  • Lead-free brushed nickel faucet
  • Feedwater adapter
  • Drain saddle and water detector
You will love the five-stage filtering system of this under sink water filter that is very easy to install and operate. Check Price on Amazon

Product Specification

  • Dimensions:

    14.5 X 6 X 17 inches

  • Weight:

    20 pounds

  • Capacity:

    75 gallons per day

Pros

  • Affordable
  • Removes 98% of lead, chlorine and other contaminants
  • WQA certified
  • Good customer service

Cons

  • High wastewater to pure water ratio

Our Verdict

This under sink water filter system is WQA certified and comes with good customer service. Plus, you get efficient performance with this popular product that removes around 98% of lead, chlorine and other contaminants.

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Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter

Best Budget Under Sink Water Filter

Features Highlights

  • WQA and NSF certified
  • Direct-connect hoses
  • Effective contaminants removal
  • Selective filtration
  • Good capacity
  • Durable
A budget choice for your household, Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter helps to make your water pure and healthy by removing nearly cent percent contaminants. Check Price on Amazon

Product Specification

  • Dimensions:

    3 X 3 X 15 inches

  • Weight:

    2.95 pounds

  • Capacity:

    8,000 gallons

Pros

  • Efficient contaminants removal
  • Longevity
  • Easy installation
  • NSF approved

Cons

  • Reduces water pressure by up to 20%

Our Verdict

Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter should make into your wishlist as it is WQA and NSF-approved product. The filtration system can make your household water pure from contaminants, but at the expense of reduced water pressure.

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AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink

Best Buy Four-Stage Under Sink Filtration System

Features Highlights

  • RO system with remineralization
  • Maximum filtration
  • Four-stage filtration system
  • NSF certified
  • Easy Installation
This four-stage under sink water filtration system removes almost cent percent contaminants from your household water. Check Price on Amazon

Product Specification

  • Dimensions:

    30 X 18.4 X 18.4 inches

  • Weight:

    21.4 pounds

  • Capacity:

    365 gallons

Pros

  • Removes 99% of 88 harmful contaminants
  • NSF certified
  • Easy Installation
  • Includes remineralization process

Cons

  • The filter should be replaced every 6 months
  • Tubes must be regularly cleaned

Our Verdict

Overall, the AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink is a great product which is great if you are living in a temporary location as the lifespan of this filter is around six months.

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Aquasana 3-Stage Under Counter Water Filter System

Eco-Friendly Under Sink Water Filter with High Flow Rate

Features Highlights

  • Three-stage filtration
  • High flow rate
  • Easy filter replacement
  • Effective contaminants removal
  • NSF certified
You will love this eco-friendly and effective under-sink water system that removes around 99% of 77 chemicals while maintaining a high water flow rate. Check Price on Amazon

Product Specification

  • Dimensions:

    12 X 4.2 X 9 inches

  • Weight:

    6 pounds

  • Capacity:

    600 gallons

Pros

  • Color choice in faucets
  • Can remove 99% of 77 chemicals
  • Smart alert system
  • NSF certified

Cons

  • Needs replacement every six months
  • Does not filter out fluoride

Our Verdict

This Aquasana 3-Stage Under Counter Water Filter System is a best-buy product that you can find in the market. Thanks to its twist-off design, you just need five or fewer minutes to replace the system when there is a need for it.

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Comparison Table for Best Under Sink Water Filters

SNUnder Sink Water FiltersDimensions (inches)Weight (pounds)Capacity (gallons)
1.CuZn UC-200 Under Counter Water Filter4.5 X 4.5 X 15850,000
2.Home Master TMHP Under Sink Reverse Osmosis Filter System5 X 15 X 1518.752,000
3.Home Master TMAFC-ERP Under Sink Water Filter12 X 16 X 2014.52,000
4.APEC Top Tier Alkaline Mineral pH+ 6-Stage16 X 5.2 X 17.52575 GPD
5.Frizzlife Under Sink Water Filter System13.8 X 5.3 X 5.34.51,600
6.iSpring RCC7AK 6-Stage Drinking Water Filter System14.5 X 6 X 172075 GPD
7.Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter3 X 3 X 152.958,000
8.AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink30 X 18.4 X 18.421.4365
9.Aquasana 3-Stage Under Counter Water Filter System
12 X 4.2 X 96600

Things to Consider Before Buying Under Sink Water Filters

Before you decide to buy an under sink water filter, you need to consider a few crucial factors that help you to choose the right one for your needs. Here are some of them:

Water Pressure 

When you opt for a water filter, you should put water pressure on yop-priority. Using a water filter that delivers good water pressure is very important, especially if you don’t have enough water pressure, to begin with. The simple under sink water filter provides better water pressure than the conventional ones. However, this increased pressure comes with a downside. The water spends less time in the filter so some of the contaminants might go through the filter without being blocked. 

Filtering Capacity

Some of the filters, especially RO filters, can be extremely effective at removing a wide range of heavy metals and chemicals. Some of the models might have a very good overall filtering capacity but lack the materials needed to remove a specific contaminant. Many simple models may be designed only to remove chlorine or chloramine. 

For a better selection, you should always use a home water quality testing kit before buying an under-sink water filter. The kit shows you which contaminants have a higher presence in your water source. Depending on that, you should seek a model that is efficient at removing the particular compounds that contaminate your water. 

Cartridge Longevity

If you are looking for under-sink water filter systems, you probably have noticed that most of them need new filters every six months or so. However, some models need a filter change only once every three to five years. Most of the cartridges work in the same way, so having a cartridge capable of filtering more water means it is better-built. You can trust in the durability of the cartridge if it is made with high-quality components. In fact, the long-lasting cartridges are very efficient at filtering the contaminated water

Budget

Knowing your budget is very important when you are buying any product. The same thing applies in the case of under-sink water filters. Usually, the filter systems cost more than USD 200. In the meantime, some other systems can be worth more than half a grand.

However, the most expensive systems are not always the best. Sometimes, they come with a feature that you don’t require. Not that these features hurt you, they can be unnecessary especially if you are on a budget. 

Ease of Installation and Maintenance

Another key factor that you should take note of before buying an under-sink water filter is the installation and maintenance. If a unit is difficult to install, you might end up damaging the system during the process. A system that is easy to set up makes sure that you don’t spend money on hiring a plumber for the installation. 

Look for the products that are usually designed as Do It Yourself (DIY) projects so that there is no need for hiring a professional. Some models provide you with an instructional video that helps you out if you encounter any difficulty during the installation process. Moreover, you should look for a filtering system that is very easy to maintain. You can find many models that come with filters that can be changed under a couple of minutes. That’s time-saving and convenient at the same time. 

FAQs About Under Sink Water Filters

Everyone can benefit from cleaner water. However, under sink filters are suitable for some more than it would be for others. You should buy an under sink filter if:

You want to filter the water that comes solely from one sink.
You have limited space for installation but still want to remove contaminants from your drinking water.
You seek for a budget-friendly unit that requires low maintenance cost.
You don’t want to call plumbers and electricians at your house.
You are bored of accumulating water bottles.

An under sink water filter is a system that is installed right where you need access to clean water. It filters water directly at your home faucet or through your refrigerator for clean drinking water. An under sink water filter takes water from the under-sink cold water pipe and sends it to the plastic tube where the filter stays. Once the water is pure, the device uses its faucet to deliver the water to the user.

There is no specific answer to this question. Some of the systems will need a filter change once every six months while others can filter water up to five years without a single change. You should follow the manufacturer’s instructions and change the filters at the appropriate time. For your assistance, some models automatically notify you when it is time to change the filter.

The whole point of having an under sink water filter is to enjoy clean drinking without the need to purchase bottled water. These filters remove a wide range of contaminants from the water so that you get pure water that is safe to drink and use in other household works. Besides chlorine, silt, and soil, these filters remove rust particles, heavy metals, bacteria and germs, and even VOCs, hormones, and other microscopic particles that may have a negative impact on your health.

No you don’t! These filter systems are designed to be installed quickly and with ease, in just a couple of minutes. You don’t require additional parts or tools to put the filter in its determined place and make it work right away. There is no need to worry about anything. Just take the product and follow the provided instructions for installation.

No! These filter systems are made to be very silent. You will hardly know there is anything under your sink once it operates. They are only heard when you are standing very close to the sink. Noise should not be an issue with these under-sink filters.

Conclusion

Now that you have been through some of the best under sink water filters reviews and our comprehensive buying guide, we are certain that you can make a wise choice among the available products. Always look for the product that best suits your household needs.

In Hurry? Editor's Choice
CuZn UC-200 Under Counter Water Filter