Under Sink Water Filters

Drink with confidence.

Our award-winning under sink filters remove up to 99% of 88 contaminants to instantly transform ordinary tap water into clean, healthy water.

Patented Claryum® Technology = Healthy, Delicious Water

Our independently-certified Claryum® filtration removes the most contaminants while retaining naturally-occurring beneficial minerals to turn ordinary tap water into extraordinary water.

  • Ion exchange and sub-micron filtration tackle heavy metals like lead and mercury, along with asbestos and cysts.

  • Activated carbon removes pharmaceuticals, herbicides, pesticides, PFOA/PFAS, VOCs, and more.

  • Catalytic carbon filters chlorine and chloramines from the water you drink and the air you breathe.

  • Selective filtration retains healthy minerals like calcium, magnesium, and potassium for purely delicious filtered water.


Replace your filters regularly to keep clean, healthy water flowing.

Under Sink Replacements

Water For Life

Replacement filters auto-delivered to you — for less.

No contract, 15% off filter replacements, an extended warranty, and free shipping. That’s Water for Life.

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Aquasana — an immediate difference in every drop

  • Max Contaminant Removal

    Industry-leading results for your peace of mind.

  • Nothing Added

    No chemicals are added to your water during the filtration process.

  • The Reviews Are In

    15,000+ five-star reviews from customers just like you.

  • You Talk, We Listen

    Your feedback drives our product innovation.

Under Sink Water Filter Systems for Healthy, Great-Tasting Water

You use water for everything—from washing vegetables to filling your family's glasses at dinner. For most homes, municipalities treat drinking water with chemicals including chlorine and chloramines to rid it of contaminants. While chlorine and chloramines are successful in treating bacteria in your water, they can miss certain contaminants that are harmful to your overall health and well-being. That's why you should protect your family by installing a drinking water filter system under your sink or on your counter.

Aquasana's drinking water filter systems reduce 15x more contaminants than the leading pitcher filter. Our superior NSF certified Claryum® filtration technology removes up to 99% of lead and other contaminants including VOCs, cysts, asbestos, herbicides, pesticides, chlorine, chloramines, and much more. All while retaining naturally-occurring minerals—like calcium, magnesium, and potassium that improve the pH balance and nutrition of your water.

Choose the Best Under Sink Water Filtration System for Your Home

Under sink water filters are a popular alternative because they remove more contaminants than most pitcher-based options. Additionally, using an under sink filtration system enables you to instantly enjoy clean water straight from the tap without waiting or taking up valuable counter/fridge space.

Aquasana offers several under sink water filtration systems such as our OptimH2O® Reverse Osmosis + Claryum Filter in addition to our 2- and 3-Stage Claryum® filters. As an added bonus, many include a dedicated faucet that dispenses filtered water.

To help determine which under sink water filter is right for you, identify what contaminants are the most important to filter out of your home. If you are looking to reduce the highest number of contaminants, our OptimH2O® Reverse Osmosis + Claryum Filter may be the choice for you. It reduces 88 contaminants—including 95% of fluoride and mercury, 97% of chlorine and arsenic, and 99% of lead and asbestos among other contaminants.

Some reverse osmosis (RO) systems are so efficient at filtering that they also remove healthy minerals, impacting the taste and health benefits of your water. However, our remineralization technology restores a good pH balance—along with calcium, magnesium, and potassium to ensure your drinking water contains vital minerals, has optimal alkalinity, and tastes great.

Other under sink water filtration systems to consider include:

  • Claryum® 3-Stage: Removes up to 99% of lead & 76 other contaminants
  • Claryum® 3-Stage Max Flow: An upgraded version of the Claryum® 3-Stage, now featuring a 44% faster flow rate and 800 gallons of filter life
  • Claryum® 2-Stage: Reduces the presence of 77 harmful contaminants including lead and mercury

All of these under sink filters are tested and certified to reduce chlorine, chloramines, herbicides, pesticides, pharmaceuticals and more in your drinking water.

If you prefer a countertop drinking water filter, our systems use NSF certified Claryum® filtration technology proven to remove up to 99% of lead, asbestos, chlorine, chloramines, and 73 other harmful contaminants.

How to Install and Replace Our Under Sink Water Filters

Each unit comes with its own detailed step-by-step installation instructions in addition to a video guide to help simplify the setup process. Replacement is quick and easy, but will vary in frequency depending on use. For more information on how often to replace components within our under sink water filters—check out our under sink and countertop filter replacement page.

If you have additional questions about installation, replacement, or our products in general—please contact us for customer support.

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