Best Under sink water filter

7 Must-Try Under Sink Water Filter System Reviews

Under sink water filter is an innovation which helps families make their drinking water safe for consumption. Instead of using wide space on the counter, this product uses space from the cabinet beneath the sink. Sometimes, it requires professional plumbing modifications or drilling a hole for the dispenser at the countertop.

The under sink water filter works by getting its water from the cold water pipe, sends it at a plastic tube to the water filter, and delivers the filtered water on a special faucet on the sink.

The system has constant pressure thus when one opens the faucet, the water will flow directly. In under sink water filter, only the drinking water produced at the special faucet is filtered. The regular hot and cold water functions of the sink is independent of the system.

Nowadays, there are various types of under sink water filtration system available. Check out some of the best products in the market today:

Aquasana AQ-5300.56 3-Stage Under Sink Water Filter System 

The first product is the Aquasana AQ-5300.56 under sink water filter system. Aquasana is a company based in Austin, Texas and they specialize in creating water filtration solution for every modern home. Recently, Aquasana received NSF (National Sanitation Foundation) certification for the removal of PFOA and PFOS which can be found in non-stick cookware.

This under sink water filter is available in various colors such as chrome, brushed nickel, and oil-rubbed bronze. The product dimension is 12″ x 4.2″ x 9″ and it weighs about 6.2 pounds.

The faucet included is made of 100% metal and it is 100% lead-free. Its height measures 8.78 inches and its width measures 5.7 inches. The system was certified by NSF to meet standards 42, 53 + 401, and P473. 

The filter features a Claryum Filtration Technology that removes 99% of 68 contaminants in the water such as pesticides, chlorine, mercury, and lead and retains beneficial minerals. This technology includes catalytic carbon, activated carbon, 20-micron pre-filter, and sub micron mechanical filtration.

In addition, the filter can be easily installed, replace, and maintain. It can last up to 6 months and it can produce up to 600 gallons of water. The system can also alert you when the product needs changing. It has a light indicator which is powered by one lithium-ion battery that is included in the package.

Finally, this product is eco-friendly with minimal disposable plastic parts. The company offers a one-year warranty on the product that has factory defects.

Culligan US-EZ-1 EZ-Change Undersink Drinking Water Filtration System with Dedicated Faucet

Meanwhile, the Culligan under sink water filter is an awesome product to have in your home too!

Culligan is a company based in the United States that leads in making residential and industrial water treatment. The company was established in 2015 and since then, they are receiving good feedbacks in their water testing, softening, and filtration services.

This Culligan under sink water filtration system can produce better tasting drinking water for the family. The product dimension is 13″ x 9″ x 4″ and it weighs about 2.6 pounds. It is available in white color only.

This product includes a faucet which fits in majority of kitchen sinks, head assembly, RC EZ-1 filter cartridge, 1/4 inches clear tubing, mounting hardware, sticker to remind of cartridge change, and a manual for easy installation.

The RC EZ-1 filter cartridge can remove chloride, particulate class III, foul odor, and bad taste of the water. It is tested and approved by NSF International with Standard 42. The filter cartridge can connect quickly in any fittings and you just need to twist it. Furthermore, it can filter up to 3,000 gallons of water or it can work for up to one year.

The water flow rate of the faucet is 5 gallons per minute (GPM) at 60 pounds per square inch (PSI). Finally, the company offers a two-year limited warranty on the products.

CuZn UC-200 Under Counter Water Filter 

Another must try is the CuZn UC-200 under counter water filter. The CuZn Water and Air Filters was established in 1987 and since then they create innovative solutions for water filtration in residential and commercial establishments.

They are a member of Water Quality Association (WQA), their products are eco-friendly, and it is from the United States.

Some of their products are whole house water filters, kitchen water filters, bath and shower water filters, RV and garden water filters and others.

One of their bestsellers is the UC-200 water filter. The product dimension is 4″ x 4″ x 15.5″ and it weighs about 7.8 pounds.

This product can work beneath office or home sink and it can produce up to 50,000 gallons of water. You can replace the filter every 5 years.

Meanwhile, the filters include the micro sediment membranes and UC-200 technology. The UC-200 includes powerful KDF-55 filtration technique and acid washed coconut shell activated carbon which was tested and certified by NSF standard 42 and 61. This filtration system can remove contaminants and retain the good bacteria for the body.

In addition, this product has low maintenance and you can install it in few minutes directly to your kitchen sink’s cold water line. There is no need for tools or any handyman in the installation.

Lastly, the flow rate of the water is 2 gallons per minute (GPM). Its height measures 15″, width measures 4″, and the depth measures 4″.

Express Water 5 Stage Undersink Reverse Osmosis Drinking Water Filtration System

The Express Water offers reverse osmosis under sink water filtration system. The Express Water company is located in California and they have been providing reverse osmosis water solution for almost 25 years. Their reverse osmosis system includes alkaline, deionization, and ultraviolet technology.

One of their bestsellers is the 5 stage under sink water filtration system. The 1st stage includes 5-micron melt-blown polypropylene sediment and the 2nd stage includes granular activated carbon (GAC). Meanwhile, the 3rd stage includes another 5-micron carbon filters, the 4th stage has thin film GPD and semipermeable membrane (ROM) element, and the 5th stage has an inline granular carbon filter.

The product dimension is 18.2″ x 19″ x 16″ and it weighs about 30 pounds. The filtration unit measures 15″ in width, 16″ in height, and 5″ in depth. Meanwhile, the storage tank measures 11″ in width, 16″ in height, and 11″ in diameter. The faucet measures 5″ in width, 11″ in height, and its base diameter is 2″.

The system capacity is up to 50 gallons per day (GPD), the tank capacity is 4 gallons, while its maximum total dissolved solids (TDS) is 1,000 parts per million (PPM). On the other hand, its feed water pressure is 40 to 80 pounds per square inch (PSI) and the feed water is 38 to 100 degrees Fahrenheit.

It includes a manual for easy set-up, drains saddle, color tubing, feed valve, flow restrictor, ASO valve, and housing wrench. Finally, the products of Express Water is easy to install and requires low maintenance.

Filtrete Maximum Under Sink Water Filtration System

The next under sink water filter is the Filtrete maximum. Filtrete filters are from the 3M brand. For over 25 years, the Filtrete filters create water and air filters for residential and commercial use.

One of their popular products is the Filtrete maximum under sink water filter. This product can remove up to 99% of lead, microbial cysts, sands, rust, chlorine, and even the bad taste and smell of the water.

The filters can provide high water flow rate of 1.5 gallons per minute. It can work for about 6 months and it can be easily installed under your kitchen sink.

In addition, it is tested and certified by NSF International to Standard 42 and 53.  The product dimension is 3.5″ x 3.5″ x 14″ and it weighs about 2.2 pounds.

iSpring Water Systems RCC7AK 6-Stage Under-Sink Reverse Osmosis Drinking Water Filtration System with Alkaline Remineralization Filter 

Another in the list is from iSpring Water Systems or 123filter. The iSpring Water Systems is located in Alberta, Georgia and for 10 years they are focusing on reverse osmosis water filtration technology for the commercial and residential setting.

The 6-stage under sink water filter is one of their best products. It can filter up to 1,000 contaminants in the water and it can fit in the majority of kitchen sinks.

The filter includes a thin-film composite semipermeable membrane which can filter up to 0.0001 of a micron. It also includes an alkaline remineralization filter that can balance the pH level using calcite. Unlike other brands, this product will introduce beneficial minerals in the water such as sodium, potassium, magnesium, and calcium.

The measurement of the main body is 14.5″ x 5.2″ x 18.5″ and it weighs about 20 pounds. Meanwhile, the tank measures 16″ x 11″.

The product includes a faucet with brushed nickel finish, RO machine, pre-filter housings (two opaque and one transparent), complete filter pack, 3.2-gallon pressurized tank, four color tubings, drain saddle, feed water adapter, spare fittings and O-rings, and a manual.

Moreover, the company offers one-year limited warranty and money-back to its customers. They also offer lifetime technical support.

Finally, the iSpring under sink water filter has been tested and certified by WQA and it has a gold seal which means that its quality is exceptional.

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

The last under sink water filter is the Woder 10K water filtration system. The Woder K products are made in the United States and they exceed industry standards of ANSI and NSF.

Their products last 6 times more than the average water filtration system. It can remove 99% of contaminants and improve water filter cartridge. Some of their products are the 5K inline water filter, 10K under sink water filter, 10K Gen II water filtration system, fluoride removal filter, and survival water filter bottle.

One of their products is the 10-K Gen II ultra high capacity water filtration system.

This product can last up to 10,000 gallons of water or about three years of regular use. It can filter contaminants and retain beneficial minerals in the water.

The package includes a head with a built-in valve, filter, inlet hose that measures 3/8 inches by 1/4 standard pipe female, and outlet hose of 3/8 inches by 1/4 standard pipe male.

The product dimension is 3″ x 3″ x 15″ and it weighs about 2.9 pounds. The product is made of Non-BPA or Vynal Chloride Plastic and it has a flow rate of 5 gallons per minute (GPM). Finally, it can work on a temperature range of 43 to 100 degrees Fahrenheit.

What to look for in buying under sink water filter?

There are various considerations in buying for the perfect under sink water filtration system.

First, determine your water source and check its quality. Most of the water source today is tap water and it is usually perfectly safe. However, some water source tastes funny and has a bad odor; thus many families would consider installing water filters to make it potable.

Second, determine the kind of contaminants you wish to remove from your water source. Different filters work on different water contaminants.

To remove sediments, scale, and rust; a whole-house filtration works best. For organic chemicals, solvents, and byproducts of chlorine, a countertop water filter will seem fit. Many families would have a combination of whole-house, countertop, or under sink water filtration system inside their house.

There are also carbon filters, reverse osmosis systems, ultra violet light, and distillers for your drinking water and be sure to choose based on your needs.

Lastly, choose products that fit your family’s needs and your budget. Some of the products in this article can produce about 1,000 gallons of clean water which are enough for the whole family. In addition, choose water filters that are easy to install and has low maintenance so you can have the best deal out of your money.


In sum, if the water in your place is already clean and you don’t have a major issue with it, then you can skip the installation of water filter in your house.

However, if you worry about the taste, the contaminants, and the odor of the water; it is best to invest in an under sink water filtration system. Under sink water filtration system is best in killing contaminants and make the tap water potable. Some of the products listed above can last for 6 months to 5 years and it can produce water for the whole family.

Remember, water is an essential need of the family thus it is our duty to make it safe for consumption. Choose products accordingly so you can save your time, money, and effort in buying.