The Best Under Sink Water Filter For Continuous Clean Water

If you are in a rush and would like to find out our top recommended under water sink filter, our suggestion is the iSpring RCC7.

Water filters come in all shapes and sizes, but some are more effective at removing contaminants than others. The best under sink water filter fits neatly out of sight beneath your kitchen sink, reduces massive amounts of heavy metals, chlorine, lead, and other contaminants, and it’s easy to maintain!

Why Get an Under Sink Water Filter? 

The water that flows from our faucets isn’t always as clean as we’d like it to be. Sewage, arsenic, pesticides, lead, and cyanide are common contaminants that occasionally find their way into our municipal drinking water. These contaminants can cause significant health problems, especially in those with developing or compromised immune systems, such as young children and the elderly. 

Safe, clean drinking water is imperative to the health of any community. A home water filter can help reduce the number of contaminants found in local drinking water and reduce the chance of serious illness as a result of consuming contaminated water. Water filters can also remove unpleasant tastes from tap water, making it a more attractive option for those looking to avoid processed or sugary beverages.  

There are many different types of water filters. An under sink water filter connects to your sink’s plumbing and resides beneath the sink, out of sight. Commonly, these filters employ reverse osmosis to remove contaminants from water. Although, it’s important to note that the least expensive models tend to use mixed-media filters that incorporate carbon.  

These water filters typically have a high capacity, meaning that they can filter large quantities of water before needing to be cleaned. However, under sink water filters usually do not affect the water in your shower or bathrooms, which may be disappointing for those seeking such an option.

What Are the Advantages and Disadvantages of Owning an Under Sink Water Filter? 

There are several excellent reasons to invest in an under sink water filter, ranging from personal health to personal preferences. However, there are also a few disadvantages to under sink water filters that should be addressed. Let’s get started!


  • Safe water: Under sink water filters can remove chlorine, heavy metals, pesticides, and many other contaminants. Other types of water filters only remove specific types of pollutants and cannot remove particulate matter as effectively as under sink filters.
  • Out-of-sight: While some water filters may take up precious room in your refrigerator or on a countertop, under sink water filters are kept out-of-sight beneath your sink.
  • Improved taste: Under sink water filters can remove unpleasant odors or flavors from your drinking water. 
  • Reduced plastic use: An under sink water filter can help consumers reduce the number of plastic bottles they use. Bottled water becomes unnecessary when you have perfectly clean, delicious tap water at home. 
  • Simple maintenance: Under sink water filters require very little maintenance, and internal filters are typically easy to replace or clean.  
  • Easy installation: Many under sink water filters are incredibly easy to install and do not require faucet replacement. 


  • Point-of-use: An under sink water filter only filters the water from a single source, providing clean water at the point-of-use, which is typically the kitchen sink. Those looking to supply their entire homes with filtered water may want to consider a different type of water filtration system.
  • Wasted water: An under sink water filter can produce up to 2 gallons of wastewater per every gallon of clean, drinkable water it produces. Though not every under sink water filter is guilty of this function, it could be a concern for any person attempting to reduce water waste. 

Things to Look for in an Under Sink Water Filter

Under sink water filters vary in size, capacity, and ease of installation. Understanding these differences is crucial to making the most informed purchasing decision. Let’s explore some of the things you should look for in an under sink water filter.

Contaminant Removal

The primary task of any water filter is to remove contaminants and generate safe, drinkable water. The types and amounts of pollutants any given water filter can remove depends on the type of filtration system. Carbon filters can remove chlorine, but they cannot remove minerals or salts. Typically, water filtration systems that employ multiple types of filtration tend to be the most effective at removing contaminants.

Capacity and Maintenance

A water filter’s capacity is how much water it can filter before it needs to be cleaned or changed. Some under sink water filters can produce 50,000 gallons of clean water before needing maintenance. Others may only be able to filter 1,000 gallons before a cleaning is required. 

Consider your preferred under sink water filter’s capacity before making a final purchasing decision. Higher-capacity options will almost always require less maintenance.

Ease of Installation

While most under sink water filters are easy to install and do not require any additional hardware. However, there are some under sink water filters that need a change of faucet type, which could be an unexpected impediment. Those with minimal experience with plumbing may find it challenging to install a third faucet system and may want to consider an easy-to-install model. 


Under sink water filters are generally compact as they are designed to fit snug beneath your sink, but some also feature water tanks that may consume more space. If you are looking for a water filter that takes up minimal space, you want to consider choosing a model that does not have an attached tank.

Best Under Sink Water Filters

Want to know our favorite picks on the market? Check out our under sink water filter reviews.

We will be reviewing the following products:

CuZn UC-200 Under Counter Water Filter

Price Level: $

Filtration Type: Combination Media Filter

With a 50,000 gallon capacity and a 5-year warranty, the CuZn UC-200 Under Counter Water Filter could be the longest-lasting, lowest-maintenance under sink water filter on the market. At only 15 inches in height and 4.5 inches in width, this water filter is super compact and easy to install onto your kitchen sink’s cold water line. The bacteriostatic filtration media resists mold growth, and the entire unit can be disposed of when the capacity is reached, making maintenance a non-issue.  


  • It can filter 50,000 gallons of water and last up to five years.
  • It features a two-step installation process that takes about five minutes to complete.
  • It requires virtually no maintenance.
  • A three-stage filtration uses micro sediment membranes, KDF-55, and coconut shell carbon to remove a wide range of contaminants. 


  • This under sink water filter does not remove TDS, also known as total dissolved solids. Hard water can potentially damage this filter. 

Click here to check the price on Amazon

Woder WD-S-8K-DC Under Sink Filter

Price Level: $

Filtration Type: Combination Media Filter

The Woder WD-S-8K-DC Under Sink Filter installs in minutes with a simple three-step process. No additional hardware is required as the direct connect hoses provided with the filter fit most standard 3/8-inch water valves. With a capacity of 8,000 gallons or three years of use, this water filter removes 99.9% of lead and chlorine. Also, it also removes a wide range of heavy metals and foul odors. 


  • An affordable, budget-friendly option. 
  • This filter can potentially last up to three years.
  • Removes almost 100% of lead and chlorine from drinking water. 
  • Easy three-step installation and standard-sized connection hoses.


  • It does not filter out TDS. Could potentially be rendered ineffective with hard water use. 

Click here to check the price on Amazon

iSpring RCC7AK Under Sink Water Filter System

Price Level: $$

Filtration Type: Reverse Osmosis

This reverse osmosis water filter system can remove up to 99% of more than 1,000 contaminants, such as lead, arsenic, asbestos, and TDS. The iSpring RCC7 works in six stages, employing carbon filters, reverse osmosis, and finally, an alkaline remineralization process for better taste and healthier results. This filtration system requires more under sink space than comparable models as it includes a 3.2-gallon water tank. Reverse osmosis does produce some water waste, which some may find unsuitable.


  • Removes a massive number of contaminants, including TDS.
  • Features a six-stage combination filtration system for maximum efficiency. 
  • Alkaline remineralization feature ensures the cleanest and healthiest drinking water.
  • Kit contains all the necessary hardware and fits most standard sink valves.
  • Transparent stage one filter makes it easier to know when it’s time to change your filters.


  • Requires more under sink space than other, more compact models.
  • Produces up to two gallons of wastewater per every gallon of clean water that it generates.

Click here to check the price on Amazon

Brondell Circle Under Sink Reverse Osmosis System

Price Level: $$

Filtration Type: Reverse Osmosis

Though the Brondell Circle Under Sink Reverse Osmosis System stands 16.5 inches tall and about 9 inches wide, it’s designed to fit securely beneath nearly any kitchen sink. Beautifully designed, this under sink water filter system includes a chrome faucet with an LED indicator that alerts you when it’s time to change your filter. The four-stage filtration system utilizes both carbon filters and reverse osmosis to remove lead, chlorine, radium, copper, fluoride, and many more common contaminants.


  • Excellent space-saving design despite its size.
  • Includes a faucet with an LED filter change indicator.
  • It features a flexible internal tank that regulates water pressure and helps to reduce wastewater.
  • The reverse osmosis filter can last up to two years.


  • Produces up to two gallons of wastewater per gallon of clean water produced. 
  • It may be more challenging to install than comparable models, as it includes a faucet change.

Click here to check the price on Amazon

Waterdrop RO Reverse Osmosis Water Filtration System

Price Level: $$$

Filtration Type: Reverse Osmosis

Those looking for the most efficient, aesthetically pleasing, space-saving under sink water filtration system need look no further than the Waterdrop RO Water Filtration System. Tankless and practical, this system can produce 400 gallons of clean water per day while only generating one gallon of wastewater per gallon of filtered water. The real-time water quality display and LED faucet ensure that you always know when it’s time to change your filter.


  • Aesthetically pleasing, space-saving design that you won’t want to hide beneath the sink.
  • This water filtration system removes carcinogens such as chromium and cadmium. 
  • It takes only minutes to install this system, and only seconds to change filters.
  • Tankless design reduces the incidence of mold and bacteria growth within the system.
  • It can produce up to 400 gallons of clean water per day.


  • It is more expensive than other under sink water filters.

Click here to check the price on Amazon


Each of these under sink water filters can clean large quantities of water, helping keep you and your family safe from harmful contaminants. However, there is one model that stands out among the rest. 

The iSpring RCC7 may not be the most beautiful under sink water filter, but it’s possibly the most effective. With an intelligently-designed six-stage system that employs multiple types of filtration, this device removes up to 99% of over 1,000 contaminants. Other comparable water filters use a maximum of five stages and do not add beneficial minerals back to the treated water as this model does.  

Also, the iSpring RCC7 features a transparent stage-one filter capsule that allows for easier maintenance. Producing up to 75 gallons a day, you’ll likely never run out of clean, drinkable water straight from the faucet. Installation takes a minimal amount of time, and technicians are only a call away should you encounter any issues. 

More affordable than the Waterdrop Water Filtration System and more capable than the Brondell Circle Under Sink System, the iSpring RCC7 is an excellent option for those looking to enjoy the cleanest, purest, healthiest water from their kitchen faucet, without breaking the bank.

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