9 Best Under Sink Water Filters – Reviews and Buying Guide

The CuZn UC-200 Under Counter Water Filter is a quality under sink water filter that you can find in the market that operates with a three-stage filtration system. It is effective in reducing contaminants like chlorine, sediments, lead, and heavy metals from your household water. 

The main features of this under sink water filter are:

Three-Stage Filtration System

This under sink water filter system operates in three different layers of filtration media. The outermost part of the filter is the micro sediment membrane. It helps to take care of larger sediments like sand, plastic fibers, and rust. Inside the membrane, there is an acid-washed coconut shell activated carbon that targets chemicals like chlorine, chloramine, pesticides, etc. At last, there is a layer of KDF 55, an NSF certified medium, to further control scale, bacteria, and algae. It also gets inorganic contaminants removed in this final stage.

Easy Installation

Apart from its effective multi-stage filtration system, the reason this under sink filter makes it to the list is that it’s very easy to install. It is compact with a simple design with a braided stainless steel compression hose. All you require is five minutes and a crescent wrench to connect it into the cold water line. 

Long Filter Life

The CuZn UC-200 Under Counter Water Filter can last for about 50,000 gallons of water. It means that once you have installed the system, you can basically forget about it and relax. You should replace it in about five years.  

Home Master TMHP Under Sink Reverse Osmosis Filter System is a product that is engineered to treat well water. It is effective in removing iron, chlorine, lead, and other heavy metals. Plus, the system uses UV light for destroying microorganisms. 

The primary features of this under sink water filter system are:

Advanced Purification and Softening Process

In order to prevent iron from damaging the RO membrane, this filter system is equipped with an iron pre-filter which contains advanced redox media KDF85. The RO membrane and pre-filters combine to clear out 99% of chemicals, heavy metals, sediment, pesticides, and other contaminants. Plus, it also removes 98% of iron, eliminating the typical metallic taste from well water. 

UV Light For Virus and Bacteria Removal

After the water passes through the RO membrane, it is essentially purified. Furthermore, to make sure that the water is free of any harmful microorganisms, UV light, one of the four methods approved by the FDA to purify water, is employed. This light is effective at breaking molecular bonds within the organisms’ DNA and disabling them.  

Modular Filter Design

This Home Master’s innovative filter uses a modular all-in-one design where the filter is incorporated into the filter housing and the entire filter is disposable. This makes the annual filter change effective and fast. Plus, it reduces microorganisms and biofilm build-up and also helps to eliminate leaks.  

This Home Master TMAFC-ERP Under Sink Water Filter is an under sink water filter that sets the standards for other products in the industry with its efficient and long-lasting filters and a low waste to water ratio. The three-staged system is backed by a five-year limited warranty. 

Some of the main features of this under sink water filter are:

Modular Filter Design

This innovative under sink water filter uses a modular all-in-one design where the filter gets incorporated into the filter housing. This feature helps to make annual filter changes fast and efficient and also reduces the microorganisms and biofilm build-up and also helps to eliminate leaks. Plus, the design ensures that the Home Master’s filter lasts longer than traditional RO systems’ filters. 

Better Water Efficiency and Faster Flow Rate

The inclusion of a non-electric permeate pump further improves the efficiency of the system. This device reduces water waste by up to 80% and increases water production by up to 50%. Moreover, the technology also helps to provide cleaner water by removing a condition known as TDS creep. Similarly, the Home Master’s fast flow RO kit nearly doubles the water flow rate in the faucet. 

Effective Filtration System

This model includes a set of three filters: a spun poly sediment filter, a catalytic carbon filter, a coconut shell granular activated carbon water filter, and the RO membrane. When the water passes through your home faucet, around 99% of dissolved solids, chemicals and metals are already removed. 

Installation

This under sink water filter is the easiest RO system to install. The membrane and filters come readily assembled, so you don’t need to worry about it. The system installation takes less than an hour.

The five-stage working mechanism of APEC Top Tier Alkaline Mineral pH+ 6-Stage under sink water filter makes it one of the most sought-after products. It features an alkalization process that helps to improve the taste and smell of your household water. 

The main features of this under sink water filter are:

Five Stages of Water Purification

Like other high-quality RO systems, the APEC offers five stages of water purification. The first stage includes a rough filter made of polypropylene sediments.  It helps to remove larger particles, rust, and dust from the water, protecting the membrane life. The water then passes through two carbon block membranes where 99% of chlorine, odor, and other weird tastes are taken care of. Next up, the TFC RO membrane gets rid of heavy metals such as arsenic, lead, chromium 6, radium, as well as fluoride, bacteria, and viruses. Finally, as it leaves the storage tank, the water passes another coconut shell activated carbon for removal of the odor. 

Alkalization

This under sink water filter includes the alkalization process. The calcium carbonate is added into the water in an alkalization stage which also improves the taste and smell of water.

Super Efficient APEC Carbon Blocks

The double carbon blocks can remove up to 99.99% chlorine in drinking water. The unique carbon block surface maximizes contact time to guarantee water purity and multiplies the lifetime of filters and membranes. 

Easy Installation and Maintenance

The installation process of this under sink water filter takes about an hour. The availability of easy do-it-yourself instructions and step by step installation videos helps you to easily install and operate this system. Just set it up and forget about it.  

The Frizzlife Under Sink Water Filter System is a revolutionary product that performs a two-stage water purification system for removing contaminants from the water. It comes with a multi-use feature and is very easy to install and maintain. 

The main features of this under sink water filter system are as follows:

Two-Stage Water Purification

This effective under sink filter includes a two-stage water purifier that effectively removes lead, chlorine, mercury, chromium 6, rust, volatile organic compounds, carcinogens, and odors. The sediment filter cartridge with 5-micron precision reduces particles like sand and silt from the water. Similarly, the block carbon filter cartridge with 0.5-micron precision reduces 99.99% of particles from the water.

Multi-use Feature

The combination of MK99 and MP99 filter systems allows you to have clean water from your tap and filter faucet. The pure water from the MK99 water filtration system can go to your refrigerator, icemaker, or extra Frizzlife ST3 water filter faucet. The multi-use installation gets completed using the Frizzlife Ice Maker Installation Kits.

Easy Replacement Cartridge

The filter system is very easy to install and you don’t need to do much for changing the filter cartridge. The filter head comes with a special design of auto shut-off, which means you don’t need to shut the water supply from your angle valve when you do the filter replacement.   

Fast Installation

The system includes a quick twist-in installation design that makes sure you install the system within three minutes. The same applies when you are replacing the filter cartridge.

The iSpring RCC7AK 6-Stage Drinking Water Filter System comes with a multiple-stage filtration and remineralization system, that makes it a highly-recommended product. Besides, the system is very easy to install and operate. 

Here are some of the primary features of this under sink water filter:

Multi-Staged Filtration System

This handy under-sink water filter operates in five different stages. The three pre-filters: PP sediment filter and Carbon KDF (GAC) filters help remove large contaminants and protects the RO membrane from chemicals like chlorine and chloramine. Following the pre-filters, the water passes through the RO membrane with pores as small as 0.0001 microns and becomes purified. 

Remineralization

On the RCC7AK 6-stage system, after the water passes through the RO membrane, the calcium and magnesium are reintroduced via an extra remineralization process. While this process doesn’t create a significant change in your mineral intake, it helps to alkalize the water and bring more natural taste to it. 

Easy Installation

This under-sink filter system is very easy to install. It fits under a standard kitchen sink, and it comes with all parts and well-organized instructions and videos. If you want a leak-free installation, simply push the tubing half-inch deep into the quick-fitting connectors and lock. You don’t require threading pipes for the process.

This Woder WD-S-8K-DC Ultra High Capacity Under Sink Water Filter is a budget under sink water filter that is effective in making your water free from contaminants. Along with that, you are sure to love the longevity of the product and its capability to filter around 10,000 gallons of water. 

The main features of this under sink water filter are:

Efficient Performance

This under sink filter helps to eliminate lead and chlorine by about 99.9% and also heavy metals, chromium 6, mercury, volatile organic compounds, carcinogens, and other contaminants. In addition, it also takes care of odor and bad taste so that you and your family can enjoy pure and healthy water from the tap. 

Selective Filtration

The usual reverse osmosis process filters out everything including the minerals your body needs. In contrast, the Woder filter includes a unique technology that removes over 99% contaminants while leaving in all the essential minerals. 

Long-Lasting Filter

Even though it takes about 5-10 minutes for a filter change, replacing the filter once every six months can be irritating. Thankfully, the filters used by this under-sink system can be changed once every three years. 

Easy Installation

Another best advantage of this under sink water filter is that it comes with all the pieces and accessories you need for installation. It makes sure that you don’t need to use anything else than an adjustable wrench during the setup process.

AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink is an effective filtration system that makes your household water pure by removing almost 99% contaminants from it. During the filtration process, it makes sure no water goes wasted. 

The primary features of this under sink water filter are:

Maximum Filtration

The four-stage water filtration system helps to remove 99% of 88 harmful contaminants including lead, fluoride, asbestos, chromium, mercury, pesticides, pharmaceuticals, and chlorine.

RO System with Remineralization

This under-sink water filter features a remineralization process that makes sure all the healthy minerals which are lost in the reverse osmosis are returned. The returned minerals are calcium, magnesium, and potassium.   

Easy Installation

AO Smith 4-Stage Reverse Osmosis Water Filter System Under Sink includes the first set of filters, RO tank, a stylish all-metal, brushed-nickel faucet, and all parts required for the system installation. It makes the setup process easy and convenient. 

Aquasana 3-Stage Under Counter Water Filter System is a unique under sink water filter that removes nearly cent percent contaminants from your water. In the meantime, it makes sure that no water gets wasted during the process which makes it eco-friendly as well. 

Here are some of the primary features of this under sink water filter system:

Three-Stage Filtration

This is the major attribute of this under-sink filter. It performs the filtration process in three different stages:

Stage 1- Pre-Filter: It helps to catch the rust, silt, and sediment found in water and removes heavy chemicals and metals easily. 

Stage 2- Activated Carbon: The next stage includes activated carbon that reduces organic chemicals like pharmaceuticals, herbicides, pesticides, and other volatile organic chemicals. This improves the overall taste of water and removes the chlorine odor. 

Stage 3- Catalytic Carbon: In this final stage, the catalytic carbon ensures that all heavy metals and chlorine are completely removed from your water.  

Stylish Faucet

This unique filter system comes with a nickel faucet. It allows instant access to water at any hour of the day and is very easy to use. You can pick a color among many to suit the decor in your kitchen which is very unique. 

Smart System

This water filter alerts you when there is a need to change the filters. The filters can last up to 800 gallons or six months. You don’t need to worry about the replacement either. There is no need to disconnect hoses or water lines. The filter housing easily twists off so that replacing it takes minimal effort. 

Great Performance Promise

Aquasana 3-Stage Under Counter Water Filter System ensures the removal of up to 99% of 77 contaminants including chlorine, cryptosporidium, herbicides, detergents, and other volatile organic chemicals.