6 Best Under Sink Water Filters 2020

Under sink water filters have now become more productive and advanced. They have now become more dominant to remove those impurities that were once impossible for these filter systems.

These under sink water filters have two types. One is a simple water filter unit whereas second is conventional Under sink water filter. Both of them are different from one another. It all depends on the space available and the type of sink you are using. So, first of all, it is necessary to know the difference between both of them to get the idea which one would be suitable for you.

Here, we have a buying guide where you will understand the difference between these two. Also, you will learn about various factors that you should consider before purchasing your ideal under sink water filter.

And in the next section, you will find the six best Under sink water filters to get an idea which are the best water filters available in the market.

Best Under Sink Water Filters (Comparison)

 Best Under Sink Water Filters 
Editor's ChoiceFiltrete Advanced Under Sink Water Filter
  • 1.5 gallons/min flow rate

  • 25 to 125 psi water pressure

  • 2000 gallons/filter

CuZn UC-200 Under Counter Water Filter
  • 50,000 gallons/year

  • Coconut shell carbon filter

  • Bacteriostatic System

Woder 10K-Gen3 Under Sink Water Filter
  • 2 gallons/min flow rate

  • 10,000 gallons/filter

  • Efficiency up to 99%

APEC WFS-1000 Under Sink Water Filter System
  • 12 months filter life

  • 20 to 85 PSI water pressure

  • 100% Lead-free faucet

Aquasana Under Sink Water Filter System
  • 600 gallons/filter

  • Filter Life Indicator

  • Water with Zero additives

Culligan US-600A Undersink Filtration System
  • 1 Gallon/min

  • Up to 60 PSI water pressure

  • 5 years warranty


1. Filtrete Advanced Under Sink Quick Change Water Filtration System – Best Value Undersink Water Filter

  • Product dimensions: 4 x 6.8 x 14 inches
  • Weight: 3.05 pounds
  • Efficiency: 99.99%

More Features: The water flow of your faucet doesn’t get disturbed as the filter supports full faucet flow. It can offer a flow rate of 1.5 gallons of filtered water in one minute.

Filtrete Undersink quick change water filtration system

This under sink purifier can remove various contaminants from the water like chlorine and the bad taste and odor that occurs due to the presence of chlorine. It also eliminates cysts, soil, sediment silt, sand, rust, and other hazardous pollutants like lead, pharmaceuticals, and chemicals (depending upon which system and filter you choose). It does not remove fluoride. Its filter life is about six months or 2000 gallons of water; this means the filter must be replaced after that.

It is an easy-to-install filtration system that can be attached to the existing faucet. It comes with a filter head/bracket, faucet adaptor, compression Hex Nut, and ferrule. Also, there is one filter cartridge and a filter replacement reminder sticker. It takes around less than 30 minutes to install the whole system.

The unit also comes with installation and operating instructions and features a 1-year limited warranty. This fantastic product also meets NSF standards 42 and 53.

You can also choose from Maximum, Advanced and Standard under sink water filters. These filters are interchangeable with the system. An upgrade to the Maximum filter ensures the most efficient Lead reduction. Other than this, it requires an operating pressure of 25 to 125 psi to work effectively.

2. CuZn UC-200 Under Counter Water Filter – Undersink Water Filter with Highest Filtration Capacity

  • Product dimensions: 4.5 x 4.5 x 15 inches
  • Weight: 8 pounds
  • Filter life: 6 months

More Features:Also, it enhances the water taste and removes bad smell. Moreover, this system is Bacteriostatic that prevents the development of molds or fungal growth.

CuZn water filter with highest filtration capacity

This CuZn UC-200 is a US-manufactured filter that can fit under your kitchen or office faucet in a few minutes. It comes with an amazing filtration capacity of 50,000 gallons or 5 years. This high capacity and no maintenance requirement make the CuZn UC-200 superior to its competitors. All CuZn products come with a satisfaction guarantee for 90 days.

This filtration system offers hassle-free installation. All you need is an adjustable tightening wrench. Installation manuals and videos are available online to facilitate the customers. The system gets attached to the cold water line and what you get as a result is the highly filtered water through a multi-level filtration process.

The unit uses a sediment filter, KDF-55, and coconut shell carbon filter to eliminate various impurities from the tap water. It has a three-stage filtration system that removes chlorine, various heavy metals, sediment, algae, herbicides, pesticides, and moulds.

Furthermore, the filter is not designed for well water; it is only useful to filter the municipal water. It is a water filter and not a water softening system.

3. Woder 10K-Gen3 Ultra High Capacity Under Sink Water Filter – Best Undersink Water Filter to Remove Lead

  • Product dimensions: 3 x 3 x 15 inches
  • Weight: 2.85 pounds
  • Water flow: 2 GPM

More Features: The Woder filters are also tested against the ANSI standards (American National Standards Institute) to ensure you get the fresh, clean, and healthy water like the spring water.

Woder ultra high capacity undersink water filter

Before deciding to purchase this Woder filtration system, it is essential to know that it works best with municipally treated cold drinking water or the water that has been previously disinfected. It is not designed to work with the private well water. Also, it must not be used with salty or soft water.

It does not require plumbing. The filter features two hoses that get directly connected with the faucet stem and a regular valve to provide you with filtered water efficiently and effectively. It is designed to get easily attached with the standard US kitchen or washroom sinks. Also, if we talk about its filtration capacity, then it is three years or 10,000 gallons of water. Moreover, it offers a flow rate of 2 gallons of water per minute.

The pure and healthy water that the Woder produces is free from harmful substances like chlorine, chromium 6, heavy metals, mercury, and lead. Also, the filter improves the odor and bad taste along with eliminating turbidity, and carcinogens. Selective filtration allows essential and healthy elements to pass through. These include calcium, potassium, sodium, magnesium, phosphorus, and chloride.

4. APEC WFS-1000 Super Capacity Under Sink Water Filter System – With One-Year Satisfaction Guarantee

  • Product dimensions: 18 x 12 x 10 inches
  • Weight: 14 pounds
  • Filter life: one year

More Features: The filter capacity is of 12 months, and it requires 20 to 85 psi feed pressure to work accurately.

APEC undersink water filter system

The APEC under sink filter is a solution to treat both the tap water and well water. It is manufactured in the US with the finest components available in the world. The package includes 100% lead-free faucet and JG food grade tubing that has been FDA certified.

It comes with a one-year satisfaction guarantee. Also, it has lifetime support from certified WQA water specialist. This reliable water filtration system is designed to remove chlorine, VOCs, and other chemicals from water. Also, it eliminates the bad taste and odor but does not remove TDS.

It is a three-stage filtration system that doesn’t only remove the harmful chemicals but also eliminate rust, dust, and sediment. It delivers pure water to your faucet efficiently. Also, it minimizes water wastage while maintaining healthy minerals in the water.

One thing that requires your attention is never to attach the system to a hot water source. Also, it must be installed in a sheltered environment to save it from direct sunlight.

5. Aquasana 3-Stage Under Sink Water Filter System – Removes Contaminants up to 99%

  • Product dimensions: 12 x 4.2 x 9 inches
  • Weight: 6 pounds
  • Filter life: 600 gallons of water

More Features: The installation is DIY and straightforward. Even the filter replacement is simple; twist open, remove the plastic housing and replace the filter.

Aquasana undersink water filter

The Aquasana water filtration system doesn’t only take care of the human beings but also provide healthy water for the pets to keep them safe and healthy. By using this water, not only your beverages would taste better but also the quality of your food would enhance.

This instant source of purified water removes various contaminants from water up to 99%. It eliminates mercury, pesticides, pharmaceuticals, lead, chlorine odor and taste, chloramine, sediment, rust, and silt. It features a three-stage filtration process that features sediment pre-filter, activated carbon filter, and the catalytic carbon filter.

Its filter life is of 600 gallons. Also, you can replace the filter cartridge after using six months or so. Aquasana provides water with zero additives and zero waste. Also, no harmful impurity gets back into the water to make it polluted.

It not only removes pollutants from water but also keeps the essential minerals within the water that are calcium and potassium.

6. Culligan US-600A Undersink Drinking Filtration System – Supports Different Culligan Filter Cartridges

  • Product dimensions: 4.8 x 4.8 x 12.8 inches
  • Weight: 1.74 pounds
  • Water flow: 1 GPM

More Features: The unit can clean up to 1,000 gallons of water without the cartridge replacement. The filter also comes with a five-year warranty. Also, it delivers 1 gallon of water per minute with a pressure of 60psi.

Culligan undersink water filter

The Culligan US-600A doesn’t need an additional faucet; it connects to the existing water faucet. It provides clean and clear water for drinking and cooking purposes. Its installation and cartridge replacement is quite easy; thanks to the quick attach mounting brackets. Its slim-line design makes it easy to fit in tight spaces under the sink.

The unit comes with a D-20A filter cartridge, but it is also compatible with D-10A, D-30A, and D-40A filter cartridges. Chloride along with bad water taste and odor are removed from the tap water with the help of installed D-20A filter cartridge. Other than this, it can also reduce aesthetic chlorine smell and taste.

One drawback of this unit is that despite being written that it is easy to install, it is not. Also, it comes with flimsy fittings.

Buyer’s Guide

CuZn UC-200 Water Filter

Simple vs. Conventional Under sink Water Filter 

First of all, it is important to decide which type of under sink water filter you want to purchase. Simple under sink water filters are different as compared to conventional under sink water filters. So first, you have to understand the difference between them.

Simple under sink filters are easy to install and use. To deliver the filtered water, they use your regular sink faucet instead of an additional faucet. These filters can only connect with the cold water line, so they only filter cold water, not the hot water.

On the other hand, conventional under sink filter requires an additional faucet to provide you filtered hot and cold water. When the water gets filtered, it reaches the other faucet through which you drink and use water for different purposes. And your regular faucet gets the unfiltered hot and cold water.

If we compare both the simple and conventional filters, then the simple ones are quite easy to install. You don’t need to modify your sink, and there is no need for an extra faucet. But, you may need frequent filter changing. Also, these units offer higher flow rate so there might be a possibility that some of the contaminants may remain in the water.

Now, if we talk about the conventional under sink filter units, then they are also easy to install. They filter the water better, and there is no need to change the filter cartridge frequently. But, you need an additional faucet to get the filtered water, and you have to modify your sink to accommodate that extra faucet. Also, these units offer a lower flow rate as compared to the simple under sink water filters.

Filtering Capacity

The filtering capacity of a filter depends upon the components used in the cartridge. Some filters have great filtration capacity where they easily remove most of the harmful contaminants from water. But there are also some filters that despite having good filtration capacity, not able to remove particular contaminants. This is because they don’t have the required materials equipped in the cartridges.

So, it is quite necessary to test your water to know which of the contaminants present in your tap water are harmful. And then try to find a unit that can deal with them effectively.

Water pressure

Water pressure is equally important to consider. It is good to have a unit that can deliver good water pressure. If we compare both the simple and conventional under sink water filters, then simple units offer good water pressure as compared to the conventional ones. But one thing that you should keep in mind is that due to higher water pressure some of the contaminants might pass the filer. When water passes the filter without spending much time in it, it fails to remove all the impurities present in the water.

So, if the incoming water is less contaminated, then you can go for those units that provide great water pressure, but if it is filled with contaminants, then it is necessary for you to go with a conventional under sink water filter having low water pressure.

The life span of a cartridge

The life of a cartridge mainly depends on the quality of water you are getting. If it is highly contaminated, then the life span will be reduced, but if it is filled with fewer impurities, then your cartridge may live longer.

Some cartridges need replacement after every six months whereas some have a life span of 2, 3 or 5 years.


It is ideal to have a unit that offers hassle-free installation. Hard installation might damage your system during the process, so it is better to go for a unit that offers an easy installation. It will not only save your time but your money as well.

These under sink filters come with proper installation guide and videos to help you in installing the unit easily. But if you are not capable of installing it on your own, then it is necessary to call a plumber.

Other than this, the filter cartridges must be easy to change. There are some units where you have to be an expert to replace the cartridge. On the other hand, some filtration systems offer simple filter cartridge replacement. Therefore, it is essential to select a unit that offers easy filter replacement.

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