The 6 Best Under Sink Water Filters – (Reviews & Buying Guide 2018)

Getting a water filter is undoubtedly a great choice if you want your home water to be healthier.

Even in places where the water is supposed to be clean and safe, it is still better to prevent possible dangers and get a filter that helps you get rid of any contaminant.

But if you pick the right type of filter, you may eventually get the best results.When we talk about the best under sink water filter, we need to explain that this type of filter is merely unmatched when it comes to convenience & efficiency.

But sadly, not all models are worth your money. That’s why we come with a series of the under sink water filter reviews for you to take a look and pick the right one for your needs.

Best Under Sink Water Filter Reviews

Under the sink, filters are Eco-friendly than all other water purification systems. Below you will read in detail the top under sink water filters. You will learn about their features, capacity and the contaminants they remove. We have also listed the pros and cons to ensure you get the best unit for your home.

Filtrete Advanced Under Sink Quick Change Water Filtration System

Undersink water filters are placed under the sink. They are made with a diverter valve that diverts cold water from the pipe to the water filter before reaching the kitchen faucet. The Filtrete Advanced Under Sink water filter is an effective kit that is easy to install. The filter connects directly to your kitchen and it reduces microbial cysts, sediment, bad odor and chlorine.

Easy installation

This water filter will install in less than 30 minutes so you can enjoy drinking pure water in no time. It doesn't need any dedicated faucet. It connects easily with your bath or kitchen faucet.

Water flow

Many people fear installing undersink water filters because most models affect the flow of water. You should not worry when you have this model because it will maintain full water flow on your current faucet.


You are not limited to the type of filters you can use with this water filter. Whether you want to use advanced, maximum or standard undersink replacement filters, all are interchangeable with this system.

Filter change

If you don't want to forget when to change the filters, you can sign up for filter text reminders by sending a text to 23624 with keyword "water".

Highlighted Features

  • Has a filter life of 6 months
  • The filter capacity is 2000 gallons
  • Meets NSF and ANSI standards
  • Easy to install in just 30 minutes

What People Like

  • Simple to install
  • Meets ANSI and NSF standards
  • Simple to replace filters
  • Effective filtration

Don't Like So Much

  • The flow rate may become slow with time
  • Flimsy filters

Woder 10K-Gen3 Ultra High Capacity Direct Connect Water Filtration System

The presence of lead, chlorine, heavy metals, chromium 6 and other contaminants affect the quality of water. To ensure that you enjoy pure water that tastes well, it is important to install an undersink water filter like the Woder 10K-Gen 3 filtration system. This filter is perfect for use for municipally treated water that is disinfected.

Filtration performance

The Woder filter uses a unique filtration technology that removes up to 99.99 percent of contaminants present in water. The filter also removes odors and bad taste hence giving your family pure and healthy water.

It leaves the essential minerals like calcium, potassium, sodium, magnesium and phosphorus. The filter provides you with healthy water as compared to those that use reverse osmosis because they remove everything from water including the healthy minerals.


The filter comes with everything that you need. It comes with a filter body, quick clip, screw, inlet hose, outlet hose that fit well on standard pipes. All these provide an easy and leak-proof installation.


The filter can give you a service of up to three years. If you want it to last longer, ensure that you use it with municipally treated water only. It is not ideal for use with softened or salty water.

Highlighted Features

  • Selective filtration to retain essential minerals
  • Provides pure and healthy water
  • It is long lasting
  • Has a flow rate of 2GPM
  • Easy to install

What People Like

  • Gives the water a crispy taste
  • Responsive customer service unit
  • Simple to install
  • Durable filters

Don't Like So Much

  • Customers report a reduction in flow rate contrary to the manufacturer's specification, but the reduced speed is within acceptable limits
  • May often need replacement in areas with high levels of contaminants

Woder 10K Ultra High Capacity Direct Connect Water Filtration System 

Using purified water provides you with many benefits. You can enjoy water free of contaminants, healthy drinking water, spring-like water, healthier skin and clean dishes. To achieve all these, you can install the Woder 10K Ultra High Capacity filtration system. This water filter is NSF approved so you have worries about the quality of water.

Contaminants eliminated

The water filter eliminates up to 99.9 percent heavy metal, 99.9 percent chlorine, chromium, odors and bad taste, volatile organic compounds and other contaminants. You can enjoy fresh and better smelling water so you don't have to store bottles in your fridge.

Simple installation

A good undersink water filter should install in minutes. This model provides you with 5-minute installation and it comes with a full assembly kit. The package includes the filter body, female compression, inlet hose, outlet hose, standard pipe, screw, and clip.

Selective filtration

This is one of the best water filters on the market you cannot regret buying. It removes the worst minerals from water while maintaining essential and healthy minerals.

Flow and lifespan

This undersink water filter provides you with a strong flow as compared to other filters. It has a lifespan of three years or 10,000 gallons.

Highlighted Features

  • Easy installation and comes with everything needed
  • Removes bad minerals and retains healthy minerals
  •  Meets NSF approved materials

What People Like

  • Long life filter
  • Simple to install
  • Uses selective filtration
  • Retains healthy minerals

Don't Like So Much

  • Decreases water flow rate with time
  • Replacements may be difficult for some

Culligan US-EZ-1 EZ-Change Under Sink Drinking Water Filtration System

Do you really need an undersink water filter? Yes, you do! Drinking water directly from the tap is not safe because it contains lead, chlorine, bad taste and other contaminants. If you want clean and better tasting that is free from contaminants, then consider installing the Culligan US-EZ-1 EZ-Change undersink water filter.

Dedicated faucet

This efficient water filter comes with a dedicated faucet that you can install in many sinks. With this water filter, you can be sure of clean and filtered water for drinking and cooking.

Easy filter change

Changing filters is easy and hassle-free. With its twist-on and twist-off filter mechanism, it is easy to change the filter when a replacement is required. You don't even need the help of a plumber because the water filter has quick connect fittings that simply the installation process.

Certified by NSF

This is a quality water filter that you can depend on for clean and healthy water. It meets all the requirements of NSF/ANSI.

Highlighted Features

  • Comes with a cartridge change reminder sticker
  • Double water shutoff
  • Two year limited warranty
  • Removes bad taste and odors
  • Can purify water up to 3000 gallons

What People Like

  • Removes bad taste and odor from the water
  • Uses high technology filtration media
  • Versatile to suit any kitchen sink
  • The twist-on design makes replacements simple

Don't Like So Much

  • Faulty installation may lead to leakages  
  • Installation may take a considerably long time than other competing units

Watts Inline Water Filter 20,000 Gallon Capacity

Drinking healthy water provides you and your family many health benefits. To removes the impurities that contaminate tap water, an undersink water filter is important to install at home. The Watts Inline Water Filter is an excellent water filtration solution for your home. The filter removes up to 99 percent of all the 77 contaminants present in water.

Claryum filtration technology

This is the only water filter on the market that utilizes this unique technology to remove contaminants like mercury, lead, asbestos, chlorine, chloramines, pesticides and much more. It retains healthy minerals in water like potassium and calcium.

Effective filtration

The system has a pre-filter that increases the performance capacity to provide you with up to 600 gallons of water. No additives and no water is wasted throughout the filtration process. Again, no harmful chemicals are added back to the water.

Stylish metal faucet

The system comes with a durable faucet that is 10 percent lead-free. You can choose different faucets ranging from chrome, oil rubbed bronze or brushed nickel depending on your kitchen décor.

Easy installation

The faucet, filters and all the necessary system parts are included. You can install the water filter by yourself so you don't need a plumber. Replacements are also simple in case you need to some.

Highlighted Features

  • Easy filter replacement
  • Smarter system lets you know when to change filters
  • Comes with a stylish faucet
  • Utilizes a 3-stage water filtration
  • Easy installation
  • Gives you healthy water with healthy minerals

What People Like

  • Simple to install
  • Filters are durable
  • High-quality water output
  • Compliant with the NSF standards

Don't Like So Much

  • Some users have complained about leakages
  • Reduced flow rate with time

Aquasana 3-Stage Under Sink Water Filter System with Chrome Faucet   

Our last undersink water filter in the list is the Aquasana 3-Stage filter system. The system is ideal for commercial and residential ice makers, coffee and tea brewers, campers, motorhomes and much more. The system can filter up to 420,000 gallons.

Removes bad taste and odor

Drinking water directly from the tap might contain impurities that affect its taste and quality. With this undersink water filter, it is easy to get rid of chlorine and the bad taste in water. The water filter system also reduces scale buildup and improves the clarity and taste of water.

The filter also removes sediment, chlorine, contaminants, and particulates to improve the quality of drinking water.

Easy installation and maintenance

The water filter system is designed with quick connection adapters that you can add directly in your plumbing. You can easily install it without professional assistance especially if you are conversant with DIY projects.


Before you buy any water filter, it is important to find out if it is authorized by the relevant authorities.  This unit is NSF certified for 20,000 gallons. It is also WQA certified for bacteriostatic properties to ensure a longer filtration.

Highlighted Features

  • Uses kinetic degradation fluxion treatment for water filtration
  • Easy to install and maintain
  • Includes a 10-inch KDF inline filter
  • Works well with all ¼ inch line water supply
  • It is NSF and WQA certified

What People Like

  • Simple to install
  • Removes chloramine
  • Affordable
  • Compact design

Don't Like So Much

  • Poor O-rings that don’t last long
  • It may leak after sometime

Why Should You Get An Under-Sink Filter? 

One of the main problems in maybe the entire world is that tap water is becoming more and more toxic. This happens due to contamination, even though it is not entirely true for all places or cities, it is still happening, and it can harm those who use it.

Especially in countries like the US, with plumbing in cities that are up to 50 years old, contamination with lead is pretty standard.In old houses, this is also typical, where lead-free plumbing wasn’t available when the house was built, so they used whatever seemed cheap or enough at the moment.

Well, this happens very often, and probably is the cause of many symptoms of intoxication around the world. When people drink or use water from the sink that is contaminated, they are ingesting all that lead or any other contaminant directly, which could cause severe damage to the organism.That’s why a filter is a great option. But filters for the entire house are not a great idea because they demand a lot of time, effort, and money to install – so an under-sink filter comes like the best choice.

They make your water cleaner for use, drinkable, and sometimes even help to improve the flavor if you like to drink directly from the sink.  Under sink water filter systems are exceptional without a doubt, for their convenience and overall effectiveness – getting one of these will undoubtedly improve your life.

How Undersink Water Filters Work 

As the name says, under-sink water filters are located under the sink, no matter if it is a kitchen or a bathroom.The valves from this sink are directed towards the filter, and the pipes that bring the tap water go first through the filter before reaching the sink valves. This way, the filter tries to clean or wash the water before it reaches the sink’s faucet.

But the process is not that easy nonetheless. Some filters allow owners to adapt up to three different valves for cold, hot, and unfiltered water. Others allow multiple sinks at the same time, while the minority of them may even offer the chance to store the water in a tank before being used.

It is also important to note, that there are two types of under-sink filters: conventional and straightforward.The conventional model is the one we explained before, with pipes and valves diverted towards the filter. But simple filters won’t need all that fuss.

With only diverting the tap water pipe towards the filter and then re-joining the sink valve, this type of filter is entirely straightforward. Sadly, there are not different types for this kind of filter.

You will have to filter all the water that comes through the pipe, and it won’t be redirected to new valves or different faucets according to temperature.So, no matter the filter you choose, it is vital to know that this type of filter is incredibly efficient and always provides a direct result.

You won’t have to wait for minutes for the filtered water to arrive or lose any pressure in the process. Just open the faucet, and the water should come filtered entirely and hopefully ready to drink and use in multiple ways.How does a filter do that? Easy,

it makes the water go through a series of material such as charcoal, carbon, sand, screen, disk, cloth, and sometimes even metallic objects.These materials clean the water and make sure contaminants do not pass through. So, water is delivered to your sink cleaner & healthier than it was before. It’s as simple as that.

The Benefits of Under Sink Water Filters 

As you know, there are several reasons an under sink water filter is a great choice. However, you may not know the whole spectrum and motives why precisely one of these is such as a great option. Here we go in-depth about them.

  • Convenience

Filtered water comes instantly to your faucet as soon as you open it. You won’t have to             delay any longer for your water to arrive. And if you want, you can use it for cold or hot              water in the same way and still get the same result.

If it is for drinking, it is even faster than serving glass water as well – so you get                           exceptional convenience overall.

  • Space-Efficient

They won’t take as much space as other types of filters. With only a few centimeters                  below the sink, you will be able to install a highly efficient and convenient filter                            without problems.

An under-sink filter is similar to the shape and size of a wine bottle, so you can                            imagine how little space it takes.

  • Installation

Apart from being smaller, under-sink filters are also entirely straightforward to install. Even though they are not the most relaxed kind of filter when it comes to installation - if you know your way around plumbing, establishing one of these won’t be a challenge.

  • Capacity

You may think that being smaller than other types of filters they don’t offer as much water capacity. Well, you’re wrong.

You can have up to 1,000 gallons of water or more per filter, and get exceptional results with high speed nonetheless. The water pressure on an under-sink filter is way better than any other filter out there, so you can imagine.

  • Costs

Apart from being highly affordable when compared to other types, they also demand little to no maintenance and won’t consume much electricity either.

The prices of under-sink water filters are outstanding, especially if you get a convenient under-sink water filter that filters only the water you need to filter at that moment.

  • Water Taste

Yes, apart from making water drinkable, an under-sink filter also helps to reduce the chlorine and other chemicals that make water taste awful.

These filters clean your water so much that any unpleasant taste, smell, or appearance will be completely cleared, and you’ll be able to drink your water without any problem.

Things to Consider Before Buying 

The best under sink water filtration systems are not the ones with the most features, but the ones that come to the right ones. Here we are going to talk about the different factors & features you need to consider if you want to pick the perfect filter for your home. Read up and learn!


There are two main types of under-sink filters you need to consider: simple and conventional. As said before, the differences in results are little, but the overall installation changes exponentially.

  • Simple Under Sink Water Filter

A simple filter redirects the cold water supply to pass through the filter first, and that’s it. You won’t have to install a different faucet for filtered water or eventually have different valves to use the desired water when needed; you will have filtered water at all times instead.

This type is relatively easier to install than others, and it is entirely straightforward to use. But it comes with a drawback; you will have to clean it regularly and charge filter cartridge continually, as it will be used more often than other types.

If you want clean & healthy water, you will have to do more maintenance checks than with the next class.

  • Conventional Under Sink Water Filter

In contrast with a simple filter, a conventional is slightly more challenging to install. It demands the user to redirect not only the main water pipe but also the faucet or valves.

This means you will have to install additional drains, pipes, or plugs to the ones you already have so that you can enjoy an individual filtered-water tap.

This way, you can have different options when opening the sink and makes the filter work slightly more efficiently as you won’t have to use it every time you open the sink.

Instead, you will be able to use unfiltered water, cold or hot, as well as filtered water when needed.

Ease of Installation

Apart from the type of filter and filtration system used, you need to consider how natural the product is to install. Make sure it is the easiest out there, so you won’t have to hire the most expensive plumber.

Also, make sure it fits well on your under-sink cabinet so you can avoid additional installation costs or amendments in your kitchen just to install the filter.

Another important factor here is to make sure it fits your faucet system completely. The more compatible it is to your faucet & sink, the easier and faster the installation process will be. And of course, it will probably save you money as well.

Ease of Maintenance 

It is essential to clean your filter every three to six months to make sure it stays cleans and healthy. However, not all filters are easy to clean & maintain. It is critical for costs and overall convenience that the filter is a piece of cake in this matter.

Make sure it does not need the experience of a professional and that you can do it in a matter of minutes. The smoother the filter is to clean and maintain, the better it will be over time.

How to Install an Under-Sink Water Filter

Even though it seems easy, you won’t learn how to install one of these by merely looking at several under sink water filter reviews.

You will have to really get into it and learn from different steps accordingly. Here are the three significant steps you should follow.

First: Find the Place for the Filter

The filter, if it is a simple under-sink model, you will have to place it below the sink and precisely in a place that fits with the faucet without many problems.

If it is a conventional filter, you will have to drill a hole in the sink and install a new faucet and place the filter just below this hole.

Make sure the place also helps the filter to reach the water lines properly. This way you can avoid extra installation costs or times eventually. Try to fit everything together mentally before starting to connect & tighten everything up.

Second: Connect the Pipes and Valves

After having the right place for your filter, you can start connecting the pipes and valves accordingly. Remember that a simple filter just needs the water line and the faucet attached to it and that’s it.

With a conventional model, you will have to install the new faucet and possibly new pipes as well. Make sure to have everything so it reaches the faucet entirely and can deliver the water without having to mess with unfiltered-water pipes.

Before, however, you will have to remove old pipes & tubes from the equation. If they can be reused, use them so you can save money and time.

Third: Piece Everything Tightly 

Now that you have everything on place and with all the tubes and valves connected, it is time to make sure it does not leak and that it can resist the pressure of a filter and more.

Here, you will plug every tube, splitter, faucet, and just everything together tight enough to avoid further problems.

Then just activate the water line and open the tap to wait for the water to come down. While it does, inspect under the sink to see if it leaks any water from the filter or the pipes around it.

If it does not, then you have your filter ready for use.

Maintenance Tips 

The maintenance process differs depending on the model you have. However, there are a few rules you can track to avoid common problems and make the process more efficient.

Before doing any maintenance, close all valves to prevent water from passing through the filter pipes and avoiding a mess.

Remove cartridges and housings before cleaning with any bleach or a similar chemical. Be cautious not to make a mess as filters are full of water still.

Before replacing the cartridges, make sure what type you have. Reverse osmosis systems need replacement every six months, but RO membranes may last up to two years. Don’t change them if you don’t need to.

Before trashing a filter cartridge, make sure it is dirty enough with lots of build-ups. Otherwise, you may just need to do a deep clean and make it work again for a few months or weeks more.

O-rings need replacement every one to two years. They wear out with time and may become problematic if you don’t replace them.

Clean filter housings with soap and a brush. Use bleach or any other similar cleaner for the rest of the system.

Make sure to clean everything thoroughly before installing the system once again. Avoid over bleaching the system that makes water taste awful later.

Let the filtration system to work for at least 5 minutes straight with the faucet open, so the new cartridges activate, and the system cleans any chemical residue left behind. Then you can start using the filter again.

As you see, even with the best under sink water filter, cleaning & doing maintenance can be a problem. So always make sure you do the right thing by following these tips.

Final Words

As far as choosing the best under sink water filtration hoes, we have recommended the best products currently on the market. When selecting the best unit for you, consider the lifespan capacity, which is usually in gallons.

Higher capacity is better, but if too high, there may be concerns about the effectiveness of the bacteriologist element; because when left there for months, the bacteria may grow. Consider the contaminants the unit is effective in removing, and whether it meets the set standards.

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