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7 Best Under Sink Water Filters of 2024

An under sink water filter can give you that fresh, clear water you’ve been searching for.

Clean water is a vital part of living healthily and, for most people, the majority of that water comes from a kitchen faucet. To ensure you are consuming clean water, you could install an under sink water filter, which cleans the water right before it leaves your faucet.

Under sink water filters have become increasingly popular, particularly in small homes where you might only need to purify one or two outlets. However, with so many options to choose from, it might be unclear which one you should choose, or if you should buy one at all.

To help you decide, this article will explore why under sink water filters have become popular, and why you might consider getting one. We have also provided under sink water filter reviews of our top picks, based on budget, effectiveness, size, and required maintenance.

Our Top Picks

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Product Comparison Table

Product Image of the CuZn UC-200 Under Counter
Great for First-Time Installers
CuZn UC-200 Under Counter
  • Filters 50,000 gallons of water
  • Uses KDF-55 filtration media
  • Doesn't require filter replacement
Product Image of the Frizzlife Under Sink
Best Budget Filtration System
Frizzlife Under Sink
  • Removes lead
  • Retains essential minerals
  • Built-in shut-off valve
Product Image of the Woder 10K-Gen3 High Capacity
Best Low-Maintenance
Woder 10K-Gen3 High Capacity
  • NASI certified
  • Direct connect wall-mounted
  • Filters last 3 years
Product Image of the iSpring RCC7AK 6-Stage
Great for Preserving Minerals
iSpring RCC7AK 6-Stage
  • Reverse osmosis system
  • Six-stage filtration
  • Processes 75 gallons per day
Product Image of the APEC Top Tier 5-Stage
Best Budget RO System
APEC Top Tier 5-Stage
  • Suitable for well water
  • Five-step filtration system
  • Includes lead-free faucet
Product Image of the Filtrete Advanced Under Sink
Great for Small Spaces
Filtrete Advanced Under Sink
  • Water flow rate of 2.25 GPM
  • Compact size
  • Filtrete Advanced filter
Product Image of the Express Water Ultraviolet Reverse Osmosis
Best UV RO Filter
Express Water Ultraviolet Reverse Osmosis
  • 11 stages of filtration
  • Filters 100 gallons per day
  • Approved for use with well water

The Best Under Sink Water Filter Reviews of 2024

To help you narrow down your options, we have provided reviews of what we consider the best filters you can buy today. We took both user feedback and professional reviews into consideration when picking these top-rated products, and ranked them based on budget, effectiveness, size, and required maintenance.

CuZn UC-200 Under Counter Water Filter

Best for First-Time Installers

With a small footprint, this model is suitable for use almost anywhere.

It is easy to install and low maintenance. Designed to process 50,000 gallons of water — or to be used for five years — you won’t need to worry about having to work on it regularly.

A multistage processing system provides comprehensive filtration and addresses common water problems. Test your water before buying this unit as it won’t filter out some impurities, including fluoride. It is bacteria and mold-resistant, which keeps it functioning for longer.

This product is designed to be used exclusively with municipal water. While installation is easy on standard plumbing set-ups, it can also be modified for non-standard plumbing. Customer support can be contacted for an additional installation kit or to answer any questions.

What We Like

Great Warranty

This unit includes a five-year warranty that covers product or component failure. It also comes with a great 90-day money-back guarantee to ensure customer satisfaction. If it doesn’t perform to your expectations, you can expect your return to be hassle-free with no questions asked.

Easy to Install

An excellent option for a first-time installer, everything you need is included with your purchase. Remove the hose, attach the new unit, and your filter begins working immediately — it hooks directly into the existing cold water line.

Some under sink water filters require an additional faucet or water lines, though many work without a separate faucet. For this installation, you should only need an adjustable wrench. If you find yourself stuck during the process, a detailed instruction manual and a how-to video are included to guide you.

Multistage Filtration

Although this is a single enclosed unit that doesn’t occupy much space, it still has a multistage filtration process. Acid-washed coconut shell and activated carbon target foul odors and unpleasant taste.

A micro sediment membrane works to remove debris and particles. One more stage, which uses KDF-55 filtration media, targets bacteria and inorganic contaminants such as lead and heavy metals.

The three-step filtration process leaves you with great-tasting water that contains far fewer contaminants.

No Filters to Replace

Designed to work for five years (or to process 50,000 gallons of water), there is no need to swap out filters. When the time comes, you simply remove the whole unit and replace it with a new one. This keeps maintenance simple and straightforward, with no extra care needed in the meantime.

What We Don't Like

Not for Well Water

This filter is designed for municipal water as the supply is already regulated and falls within specific parameters. Although this filtration method is a great option for light filtration of city water, it isn’t heavy-duty enough to tackle well water.

If you have a well, look for something larger and more sophisticated as your primary filtration system.

Product Specs

Weight 8 pounds
Dimensions 4.5 inches by 4.5 inches by 15 inches
Installation Method Directly connect to cold water hose; necessary installation components included
Flow Rate 2 GPM
Capacity High capacity

Our Ratings

Filtration Efficiency
4.5 / 5
Flow Rate
4 / 5
Filter Life
5 / 5
Installation Ease
5 / 5
Total Rating
4.5 / 5

User Experience

Great undercounter water filters from Cuz-n are what I've been using in my home. The installation process is straightforward, involving just the connection of two hoses, and you're set. It has improved the taste of our water significantly, removing the unpleasant chlorine flavor we had put up with earlier. Even the ice no longer has a bad taste. If you are in a hard water area, the provision of a pre-filter is an added advantage. The fact that I don't have to worry about replacing the filter for five years is a huge relief.

Frizzlife Under Sink Water Filter System

Best Budget Under Sink Water Filter

A two-stage filtration system is designed to remove the bulk of heavy-metal contaminants from your drinking water. These include mercury, rust, other organic compounds, and carcinogens. During the process, bad odors and unpleasant tastes are also filtered out of the water.

This unit is suitable for use on both ½-inch and ⅜-inch cold water lines. Converter fittings are included to make installation quick and easy. A built-in shut-off valve grants you extra control during filter changes.

Each system is designed for high capacity and will work for two years or the processing of 1,600 gallons of water. For optimal performance, look to replace the inner filter every 6 to 8 months.

What We Like

Great for Removing Lead

This is an excellent choice if you want to clear your water of heavy metals. Its two-stage filtration technology uses 0.5 microns of carbon. This sophisticated compound filter can remove 99.9% of lead from your drinking water.

Ongoing Money-Saver

Not only is this unit budget-friendly to buy and install, but it is also affordable to maintain. The inner filter costs far less to replace than enclosed plastic filter models. This means you will save money in both the short and long term.

Affordable filters also mean you can replace them more often, letting you always enjoy fresh-tasting water.

Won’t Interfere with Essential Minerals

This filter does a great job of removing impurities from your drinking water, but it is designed to intentionally leave essential minerals where they are. Calcium, potassium, sodium, and magnesium — all building blocks for a healthy body — will remain in the water.

If you have an imbalance of any of these essential minerals, including fluoride, post-filtration, you might want to consider an alternative filter.

Installation Components Included

Installation is quick and easy. This is a direct connect system that ties straight into your existing hose. Anyone can use the twist-in design, and it takes less than three minutes to set up or change.

Included with this filtration system are the following components: filter system, converter, two wrenches, water tape, three screws, one inlet hose, and one outlet hose. No additional installation materials are required.

What We Don't Like

Only for Use with Municipal Water

This model isn’t designed for heavy-duty filtration. Larger impurities and contaminants found in completely untreated water — such as that from a well — can easily clog the filter.

Even if the filter is still usable, these contaminants can significantly inhibit the water flow, slowing the filtration process.

Product Specs

Weight 4.35 pounds
Dimensions 13.8 inches by 5.6 inches by 5.3 inches
Installation Method Direct connect to cold water hose; necessary installation components included
Flow Rate 2 GPM
Capacity High capacity

Our Ratings

Filtration Efficiency
4 / 5
Flow Rate
4 / 5
Filter Life
3.5 / 5
Installation Ease
4.5 / 5
Total Rating
4 / 5

Personal Perspective

This water filter has seriously upped my hydration game. I used to cringe at the funky smell and taste of my tap water, but since installing this filter, I'm drinking more and enjoying it. The installation was straightforward, though a bit tricky due to the lack of an outlet hose. Despite this, the improvement in the quality of my water is undeniable and I've noticed a significant decrease in my soda consumption as a result.

Woder 10K-Gen3 High Capacity Filtration System

Best Low-Maintenance Under Sink Water Filter

This Woder filter is an excellent option for reducing turbidity, odors, and unwanted particles in your water.

This filtration system is easy to install and has great longevity, with minimal maintenance. You can expect to replace the filter cartridge every few years, or every 10,000 gallons, to keep your water clean and fresh.

No additional plumbing work is needed, and it is suitable for a novice to install alone. This is a direct connect model that screws into the existing cold water line; it shouldn’t be used with hot water. All the components needed to complete the installation are included with this product.

What We Like

Provides High-Quality Drinking Water

This unit removes many of the heavy-metal contaminants you don’t want in your water. It is designed to target rust, mercury, lead, chromium 6, and VOCs while also reducing odor and taste issues.

This filter not only removes the bad stuff, it also leaves the good stuff behind! Magnesium, calcium, potassium, and other essential minerals remain where they are to provide healthy and great-tasting water.

Low Maintenance

This is a high-capacity unit that is designed to work for three years without needing to be replaced. That equates to about 10,000 gallons of water.

Replacement cartridges are readily available when the time comes to refresh your filtration system.

Simple to Install

Even inexperienced DIYers can successfully install this unit.

It is a direct connect wall-mounted option that screws into your existing cold water connection line. Your purchase includes two hoses, the filter, and the head with built-in valves to make installation quick and easy.

Filters Are Fully Tested

This model — like all Woder filters — has been extensively tested. It fulfills the National American Standards Institute requirements when tested by independent laboratories. This means you can expect a high-quality product and healthy, great-tasting water.

What We Don't Like

Not Recommended for Hot Water Use

Using this filter with hot water will shorten its life expectancy. While it will still filter the water effectively, it will not last as long.

You will also need to stay away from heavy sodium and softened water to extend the filtration system’s life.

Not Suited for Well Water

Like other small filters, this model is designed for municipal water that has already been treated. This water has already had rough sediment and strong imbalances removed, making it suitable for the less intensive filtration these systems provide.

If you want to filter water from a well, you should consider a whole-house filtration system instead.

Product Specs

Weight 2.85 pounds
Dimensions 3 inches by 3 inches by 15 inches
Installation Method Direct connect; installation components included
Flow Rate 2 GPM
Capacity High capacity

Our Ratings

Filtration Efficiency
4.5 / 5
Flow Rate
4 / 5
Filter Life
4.5 / 5
Installation Ease
4.5 / 5
Total Rating
4.25 / 5

Community Feedback

When I first installed this water filter into my kitchen sink, I noticed a significant difference in the water quality compared to my previous Zero water filter. The installation process was straightforward and didn't require any professional assistance. The water, while not entirely similar to Smart Water, was a vast improvement from the hard LA water I was used to, and after a few days, I noticed the taste improved significantly. A minor drawback is a slight reduction in water pressure, but this was a small price to pay for the enhanced water quality. Despite initial reservations, I found that this filter was a worthwhile investment, providing cleaner, better-tasting water and hopefully extended longevity of my Zero water pitcher filters.

iSpring RCC7AK 6-Stage Water Filter System

Best Under Sink Water Filter for Preserving Essential Minerals

If you are looking for a little more from your water filtration system, you should consider this unit. It is a reverse osmosis system designed to fit in tight spaces while filtering and softening your water.

Although this model isn’t recommended for well water use, a variant equipped with UV filtration is available and it is appropriate for well water. This unit is capable of processing 75 gallons of water per day.

What We Like

Thoroughly Removes Contaminants

A heavy-duty system, this filter can remove over 99% of more than 1,000 different contaminants that are found in water. These include common impurities such as lead, arsenic, chlorine, and fluoride. There will also be fewer bacteria and viruses in your water when using this system — it can even combat persistent giardia.

Six-Stage Filtration

Most reverse osmosis systems have five stages of filtration. These units do an exceptional job of removing contaminants, but they are so effective that they also strip the water of essential nutrients. This can leave you with nutrient-deficient water that is also on the acidic side.

This system’s sixth stage places those minerals back into your water, leaving you with balanced water that tastes natural but is free of impurities.

High-Quality Components

The quality of the components used means your filter will last you longer and require less maintenance throughout its lifespan.

The first stage’s housing canister is transparent, letting you easily check on the primary filter’s status. Visual assessment is quick and you will know when it’s time to replace your filter.

Rigorously Tested

These filters have been extensively tested to ensure there are no leaks or drops in water pressure. This not only gives you a more efficient filtration system, but it also prevents leaks that could damage your home.

This model is approved for drinking water but does come with a “Prop 65” warning due to the PVC used in its construction. The warning is included for public awareness and is required by California law.

What We Don't Like

Complicated to Install

Reverse osmosis systems are complicated and take longer to install than direct connect units. If you have any doubts about the process, consider hiring a plumber to complete the installation.

Product Specs

Weight 20 pounds
Dimensions 14.5 inches by 5.2 inches by 18.5 inches
Installation Method Wall-mounted; installation components included
Flow Rate .05 GPM
Capacity High capacity

Our Ratings

Filtration Efficiency
5 / 5
Flow Rate
3.5 / 5
Filter Life
4 / 5
Installation Ease
3 / 5
Total Rating
3.75 / 5

First-Hand Impression

These water filtration systems have been a part of my life for about seven months now, and the transformation in my water quality is stunning. From the setup process to the filter changes, everything about this system has been user-friendly and efficient, though the initial leak in the feed water adapter was a minor hiccup. Despite the occasional cloudiness of the water, which can be off-putting but doesn't affect the taste, the end result is clear, great-tasting water that has made everything from cooking to drinking a more enjoyable experience.

APEC Top Tier 5-Stage Water Filter System

Best Budget Reverse Osmosis System

Designed with tight spaces in mind, this is a reverse osmosis system that should fit comfortably beneath your kitchen sink.

It uses a five-step filtration system that removes 99% of water contaminants. Not only will debris and sediment be removed, but so will harmful chemicals and organic agents, such as viruses and bacteria.

This includes a 100% lead-free faucet and FDA-certified food-grade tubing to complete your installation. This ensures no impurities will get into your water between the filtration system and your open faucet.

What We Like

Suitable for Well Water Use

This APEC model is capable of handling all water sources, even if the water hasn’t been treated previously. It can filter out 1,000 different contaminants and leaves your water tasting fresh and free of impurities. As you might expect, this filter is also appropriate for use on municipal water.

Exceptional Warranty

Upon registration, you receive a two-year extended warranty that covers your product for defects or damage. It is guaranteed to remove 99% of your water’s impurities and remain leak-free.

High-Quality Construction

Top-quality materials have been used in the construction of this reverse osmosis filter.

It is clearly labeled for easy installation and maintenance. The product has been designed and engineered in the United States. While components are manufactured elsewhere, all assembly occurs in the United States.

Customer Support for Installation

Installing a sophisticated water filtration system can be complicated. Thankfully, this filter comes with an easy-to-follow instruction manual. While the filter may be more complicated than others to set up, it’s still designed for homeowners to install alone.

If you encounter any difficulties during installation, customer support is available to walk you through the process. A video tutorial is also available to make installation a breeze.

What We Don't Like

You Will Lose Healthy Minerals

This filter does a fantastic job of removing harmful substances from your drinking water. However, during the filtration process, you will also lose many of the minerals you do want — ones that are beneficial to your health.

You should consider adding some of those minerals back into your water or compensating with supplements. Regularly test your water and keep an eye on your health after you install the filter.

Product Specs

Weight 25 pounds
Dimensions 16 inches by 5.2 inches by 17.5 inches
Installation Method Wall-mount
Flow Rate 0.03 GPM
Capacity High Capacity

Our Ratings

Filtration Efficiency
4.5 / 5
Flow Rate
2.5 / 5
Filter Life
4 / 5
Installation Ease
4 / 5
Total Rating
3.75 / 5

User Experience

In my quest for better-tasting and healthier water, I've found that the APEC reverse osmosis system stands out. I was initially introduced to reverse osmosis systems by a friend, and I was amazed by the difference in taste and quality compared to my city water. This APEC system takes it a notch higher, transforming my hard city water with a significant 600 ppm into a palatable 10 ppm. I've installed several APEC systems since then, and it's always been a straightforward process. Despite the occasional need for an extra tank during heavy usage, the system has consistently delivered excellent results and significantly improved the quality of my drinking water.

Filtrete Advanced Under Sink Water Filtration System

Best Under Sink Water Filter for Small Spaces

This small filter packs a tremendous punch, capable of removing rust, sediment, chlorine, and negative odors and tastes. It will reduce the contaminants in your water by more than 99%. Despite being so thorough, it won’t impede water flow.

Installation is quick and easy, taking less than half an hour. Keep in mind that you can use this filter safely anywhere outside the kitchen — something to think about before installation.

Expect to replace the filter every six months. More heavy-duty Filtrete filters can be used with this system.

What We Like

Small Footprint

You won’t have to worry about space with this filter, making it a great choice for almost any under-sink area. It is designed to be mounted against the wall, connecting directly to the cold water line.

Multiple Filter Options

This system comes equipped with a Filtrete Advanced filter. However, it is designed to work with other filters in the same line. You can choose from Maximum, Advanced, or Standard filters to get exactly the kind of filtration you need.

Simple Installation

The straightforward installation process will see your new water filter set up in just a few minutes.

Start by turning off the water, then connect the supply hose to the quick-connect outlet on the filter head. Attach the second supply hose to the other quick-connect point on the filter head.

Once the head is installed, it takes just a quarter of a turn to lock the filter into place. Turn the water back on and you will be up and running.

Great Water Flow

With a water flow rate of 2.25 GPM, this unit provides fast filtration. It is intended to process 2,000 gallons of water and should be replaced every six months.

If your water has more sediment or you use more water than the average household, you may need to replace it more frequently.

What We Don't Like

You May Need a More Substantial Filtration System

This filter is intended for low-demand usage and may not be sufficient for heavy-duty filtration.

Although this filter won’t slow the water flow, it can become clogged by larger sediment or debris. If your water has a lot of impurities, as is usually the case with well water, you may want to consider a different kind of filter. Check out an APEC or Express Water filter.

Double Check Your Hoses

This product includes most of what you need to complete your installation. Standard sink hoses are usually 1/2-inch or 3/8-inch.

While some under sink inline water filter products include fittings for conversion, this one doesn’t. To complete the installation, you will need to make sure this unit works with your hoses, or buy the necessary components separately.

Product Specs

Weight 3.17 pounds
Dimensions 4 inches by 6.8 inches by 14 inches
Installation Method Wall-mounted direct connect
Flow Rate 2.25 GPM
Capacity High capacity

Our Ratings

Filtration Efficiency
4 / 5
Flow Rate
4.5 / 5
Filter Life
3.5 / 5
Installation Ease
4.5 / 5
Total Rating
4 / 5

Personal Perspective

I'm absolutely thrilled with this filtration unit that I've been using for the past three years. It was a breeze to install and does an exceptional job at eliminating odors and filtering out harmful particles in the water. In my quest for the purest water, I initially paired it with a more high-end system, but the convenience and superior performance of this unit made the other system unnecessary. I've noticed a significant improvement in taste, whether I'm using the filtered water for cooking, brewing coffee, or even filling up my pet's water bowl. While there was a minor hiccup with a replacement filter, the company was quick to rectify the issue, demonstrating their commitment to product quality and customer satisfaction.

Express Water Ultraviolet Reverse Osmosis Filter

Best UV Reverse Osmosis Filter

If you have been looking for an under sink water filter that can handle heavy-duty filtration, your search might be at an end.

Its 11-stage filtration process removes contaminants, keeps your water mineral-rich, and leaves it tasting fresh and clean. Odor, sediment, and other impurities are removed from your water without impacting convenience or reducing flow rate.

Although this filter is more complicated to install than others, it is designed to be user-friendly. A color-coded installation system helps you through the setup process and cartridge replacement. This makes self-installation far more achievable.

It has been tested and certified by independent laboratories and comes with a one-year warranty.

What We Like

11 Different Stages of Filtration

Each filtration stage targets a different issue, leaving you with fresh-tasting water that is free of impurities.

Stages 1 to 5 work as expected of a traditional reverse osmosis unit.

Stages 5 to 9, the alkaline filter stages, add the healthy minerals back into the water.

Stage 10 uses an ultraviolet filter to destroy harmful microorganisms such as E. coli.

In the final stage of filtration, the water is passed back through a post-activated carbon filter to ensure it tastes fresh.

Approved for Use with Well Water

This is an under sink filtration unit, but it can still deal with the toughest of water sources, such as previously untreated water, well water, and natural water sources.

It is equipped to remove organic microorganisms, bacteria, and viruses, so you can rest assured that your water is safe for consumption.

Exceptional Capacity

Reverse osmosis systems are more sophisticated, so it takes longer for the water to make its way through them. This unit processes 0.8 GPM and can filter 100 gallons of water per day.

Versatile Product

This filter can be used anywhere; your home, apartment, office, or an RV. This is a major bonus as most comparable products are designed to be used in a specific type of space.

What We Don't Like

Isn’t Compact

With multiple cartridges needed to complete the 11 stages of filtration, this system is not compact. Even if you have ample space under your kitchen sink, you might struggle to fit this filter in comfortably.

Requires Maintenance

You will probably love that the complex filtration process produces great-tasting water. However, if you’re looking for a unit that you can set up and ignore, this isn’t it. The pre-filters (sediment, carbon block, and granular activated carbon) need to be replaced every six months.

The rest of your filters will need to be replaced yearly. Although filter changes are designed to be quick and easy, they are still an extra task you will need to take care of. Replacing filters will also add to the cost of keeping your system running.

Product Specs

Weight 30.2 pounds
Dimensions 15 inches by 14 inches by 5 inches
Installation Method Wall-mount
Flow Rate 0.8 GPM/100 gallons a day
Capacity High capacity

Our Ratings

Filtration Efficiency
4.5 / 5
Flow Rate
3 / 5
Filter Life
3.5 / 5
Installation Ease
3.5 / 5
Total Rating
3.5 / 5

Community Feedback

I'm thrilled with this water filter system, as it's not only simple to install but also delivers excellent tasting water. Even though I'm not typically good with technical stuff, the color-coded jacks and hoses made the installation process straightforward. It's important to carefully follow the instructions, especially when it comes to the system flush operation, to ensure the best taste. Also, the customer support was exceptional, even replacing parts that I accidentally damaged without any charge.

Product Comparison Chart

Product Best For Weight Dimensions Installation Method Flow Rate Capacity
CuZn UC-200 Under Counter First-Time Installers 8 lbs 4.5″ x 4.5″ x 15″ Directly connect – cold water hose; necessary installation components included 2 GPM High capacity
Frizzlife Under Sink Budget Filtration System 4.35 lbs 13.8″ x 5.6″ x 5.3″ Direct connect – cold water hose; necessary installation components included 2 GPM High capacity
Woder 10K-Gen3 High Capacity Low-Maintenance 2.85 lbs 3″ x 3″ x 15″ Direct connect; installation components included 2 GPM High capacity
iSpring RCC7AK 6-Stage Preserving Minerals 20 lbs 14.5″ x 5.2″ x 18.5″ Wall-mounted; installation components included .05 GPM High capacity
APEC Top Tier 5-Stage Budget RO System 25 lbs 16″ x 5.2″ x 17.5″ Wall-mount 0.03 GPM High Capacity
Filtrete Advanced Under Sink Small Spaces 3.17 lbs 4″ x 6.8″ x 14″ Wall-mounted direct connect 2.25 GPM High capacity
Express Water Ultraviolet Reverse Osmosis UV RO Filter 30.2 lbs 15″ x 14″ x 5″ Wall-mount 0.8 GPM/100 gal. a day High capacity

Types of Under Sink Water Filters

There are two broad types of water filters you will encounter in under-sink models: reverse osmosis and charcoal.

Reverse Osmosis

Reverse osmosis filtration systems are considered the gold standard of residential filters. They are capable of removing a variety of contaminants and are available in both large and small units.

Although these filters are highly effective, their main drawback is that they often cause a noticeable decrease in water pressure.

Reverse osmosis filters provide clean, safe water. Just keep in mind that they also require more comprehensive maintenance. Many systems are complicated and can be challenging for an inexperienced handyman to install alone.


  • Removes many different impurities
  • Works on all water types
  • Provides great tasting water


  • Can be challenging to install
  • Usually more expensive with more upkeep


Carbon filtering uses active charcoal carbon filters to remove impurities from the water. It works very well at removing chlorine, sediment, and VOCs, leaving you with odor-free, better-tasting water.

These filters are quite environmentally friendly and can be very affordable. They are also straightforward to install and, while they do require maintenance, replacement filters are inexpensive and easy to swap out.


  • Affordable
  • Space-saving and easy to install
  • Can be used on most plumbing systems


  • May need frequent filter replacements
  • Won’t filter all impurities

How to Choose (Buying Guide)

When it comes to an under sink water filtration system, everyone’s situation is different. Which filter you need will depend on your local water supply, the size of your home, and whether or not you want to remove the mineral content from your water. To help you find your ideal filter, keep the following in mind:

Test Your Water

It’s easy to test your water using an at-home water test kit. A simple test can tell you which impurities are in your water, which should help you narrow down your filter options (1).

Look for Soft Water

Ideally, you want your water to be odorless and to taste clean and fresh. Soft water will provide the refreshing taste you’re looking for, so focus on the filters that can turn hard water into soft.

Consider the Output Rate

Every water filter system will have an output rate listed among its specifications. This measurement tells you how quickly the unit can filter your water. The higher the output rate, the more filtered water you will be able to receive quickly.

Check Compatibility

If you have an older or non-standard sink, you must ensure that the filter you choose will fit your plumbing system. If your plumbing is difficult to work with, you might need to consider paying for professional installation.

Maintenance and Ease of Use

There are some very complicated filter systems out there. If you intend to install and maintain the filter yourself, look for units that are easy to work with and require minimal maintenance.

Consider a Multistage System

If you want truly refreshing water, a multistage system may be the way to go. The water passes through dedicated canisters, each designed to remove a specific contaminant to provide far cleaner water overall.

Establish Your Budget

A simple charcoal filter can do a great job of removing contaminants without breaking the bank. A sophisticated system can remove more, but this extra effectiveness will be reflected in its price. Know what you need from a filter and how much you are willing to spend before you start shopping.

On City Water?

Always pay attention to water warnings issued by your local authority. Whether it is related to a contaminant, drought, or burst water main, this information will help you plan ahead and stay healthy.


What Is an Under Sink Water Filter?

An under sink water filter is a filtration system that is mounted beneath your sink or countertop. Like a filter pitcher or countertop water filter, it removes contaminants and impurities from your water supply. By filtering out anything that taints your water supply as it travels to your home, you will be left with water that tastes better and is safer to drink.

All water filtration systems can improve your water quality, but an under counter water filter doesn’t require any extra work on your part. Once it is installed, the filter will be active whenever you turn the faucet on. There’s no need to worry about refilling a pitcher or flicking a switch every time you want clean water.

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What Is the Best Under Sink Water Filter?

The best type of under sink water filter is a reverse osmosis filter, which will work with any water type and filters out a huge range of harmful substances that might be in your water supply. They are considered the gold standard of home water filters, but they are more expensive, quite complicated to install, and might also filter out beneficial minerals in your water.

What Are the Disadvantages of Filtered Water?

Depending on how clean your water supply is, filtered water is kinder to both yourself and your home’s plumbing. However, there are some drawbacks. Filtering your water costs money, and it could be unnecessary if your water supply is already very clean. Some filters will also be too thorough and can filter out beneficial minerals and fluoride, both of which can be beneficial to your body in small amounts.

Is an Under Sink or Whole House Water Filter Better?

Whether you should get an under sink or whole house water filter depends on your circumstances. If you have a large home with numerous outlets, a whole house filter will ensure everyone in your home receives the same clean water. On the other hand, if you have a holiday cabin that only has one main water outlet, an under sink filter will be sufficient without needing to spend a lot of money. Consider under sink for small homes and the whole house for large ones.

Are Under Sink Water Filters Worth It?

Under-sink water filters are worth it if you’re having problems with tap water that’s not safe to drink. Even though they do not generate cooled water, under-the-counter water filters give your household cleaner water and a better flavor than water pitcher filters.

Additionally, given their user-friendliness and high level of filtering capability, under-sink water filters are the superior option for many households.

How Long Do Under Sink Water Filters Last?

Under sink filters used in residential homes can last between 6 months and one year. Those used in a commercial setting should be changed every six months, preferably every 4.

Are Under Sink Water Filters Safe?

There is no reason to consider under-sink water filters unsafe. Under-sink water filters give users quick and easy access to filtered water from a single point of water entry.

As a result, you won’t have to spend more money on a more expensive solution or continually refill a pitcher. In addition to that, because they don’t generate any effluent, under-sink filters are becoming an increasingly popular choice in today’s market.

How Often Should I Replace My Under Sink Water Filter?

When used in a commercial setting, an under-sink water filter usually lasts four to six months and up to a year when used in a residential home.

Which Is Better, Reverse Osmosis or Filtration?

Generally speaking, reverse osmosis is considered the best water filtration form. It is possible to remove nearly anything from water using reverse osmosis, but the process is more effective if big particles are removed from the water first.

This helps prevent the membrane from being clogged too quickly. When a membrane becomes contaminated, the quality and quantity of the water it produces are diminished.

What Do Under Sink Water Filters Not Remove?

Under sink water filters can’t remove bacteria from the water since they are not purifiers. However, the correct answer to this question is based on the type of filter in questions. For instance, some filters can remove chemicals but can’t eliminate germs in the water.

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About the Author

Peter Gray

Peter has been a homeowner for 35+ years and has always done his own repair and improvement tasks. As a retired plumber, Peter now spends his time teaching others how they can fix leaks, replace faucets, and make home improvements on a budget.