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

Getting the best under sink water filter is handy for several reasons. First, it removes pollutants from the water including heavy metals; making the water safe to drink and tasteful.

Second, under sink water filters are simple to install. Third, their design makes it simple to maintain. Fourth, these filters remain hidden hence very convenient. Lastly, they feature high-quality, durable construction material.

Under the sink, water filters overdo reverse osmosis systems because they do not produce waste water. I will review top six under sink water filter system in the market. My team and I have selected six under sink water filters that embody the best options to suit different budgets.

Reviews of the Best under Sink Water Filters

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

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 bacteriostatic 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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