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The best under-sink water filters for most homes
The Aquasana 3-Stage Max Flow Claryum wins for strong certified filtration, easy filter changes and steady flow; the Culligan costs less.
| Best overall | Best value | Cheapest that's still good | |
|---|---|---|---|
| Product | Aquasana 3-Stage Max Flow Claryum AQ-5300+ | Culligan EZ-Change Level 3 Under-Sink Drinking Water Filtration System US-EZ-3 | Express Water RO5DX Reverse Osmosis Filtration System |
| Price | about $225 | about $90 | about $170 |
| Why | Good Housekeeping’s top pick, it combines NSF certifications 42, 53 and 401 with claims covering 78 contaminants, including lead, cysts and PFAS. Reviewers found it easy to install and reported no premature clogging or noticeable flow drop during months of home use. | Good Housekeeping names this its best-value pick: it costs less upfront and uses one compact filter with a simple twist-on replacement. Its certified contaminant reduction includes lead, mercury and cysts, while reducing chlorine taste and odor. | Bob Vila’s testers rated it 5/5 for performance and value, recommending it as their best bang for the buck. It is a full reverse-osmosis system with broad stated contaminant coverage, including lead, arsenic, fluoride and dissolved solids. |
| Good to know | Replacement filters cost about $140 a year, and the three-stage unit takes up more cabinet space than simpler models. | It covers fewer contaminant categories than the Aquasana and its filter has a lower capacity. | It is bulky, and reviewers warn the water may remain cloudy for up to two weeks after installation. |
| See on Amazon | See on Amazon | See on Amazon |
picture by AIGood Housekeeping’s top pick, it combines NSF certifications 42, 53 and 401 with claims covering 78 contaminants, including lead, cysts and PFAS. Reviewers found it easy to install and reported no premature clogging or noticeable flow drop during months of home use.
Good to know: Replacement filters cost about $140 a year, and the three-stage unit takes up more cabinet space than simpler models.
See on Amazonpicture by AIGood Housekeeping names this its best-value pick: it costs less upfront and uses one compact filter with a simple twist-on replacement. Its certified contaminant reduction includes lead, mercury and cysts, while reducing chlorine taste and odor.
Good to know: It covers fewer contaminant categories than the Aquasana and its filter has a lower capacity.
See on Amazonpicture by AIBob Vila’s testers rated it 5/5 for performance and value, recommending it as their best bang for the buck. It is a full reverse-osmosis system with broad stated contaminant coverage, including lead, arsenic, fluoride and dissolved solids.
Good to know: It is bulky, and reviewers warn the water may remain cloudy for up to two weeks after installation.
See on AmazonDanilli may earn a small commission from Amazon or the store when you buy through these buttons. The price is the same for you. Pictures marked "picture by AI" are made by Danilli's AI to show the product; check the real photos on the store page.
What matters
Choose a filter based on the contaminants in your water and verify its specific NSF certifications; no one filter removes everything. Also check cabinet space, replacement-filter cost and whether you’re comfortable installing a separate faucet.
Who this is for
These picks are for U.S. households seeking filtered drinking and cooking water at the kitchen sink. If you have a private well or a known contamination issue, test your water and choose a system certified for that specific concern.
The picks, one by one
Best overall: Aquasana 3-Stage Max Flow Claryum AQ-5300+
Good Housekeeping’s top pick, it combines NSF certifications 42, 53 and 401 with claims covering 78 contaminants, including lead, cysts and PFAS. Reviewers found it easy to install and reported no premature clogging or noticeable flow drop during months of home use. It uses three filtration stages and has an 800-gallon capacity, with a reported flow rate of 0.72 gallons per minute. The twist-off filters make replacement straightforward, and the dispenser comes in three finishes. Expect more cabinet space and higher annual replacement costs than with simpler single-filter systems. Skip it if cabinet space or ongoing filter expense is your main constraint.
Good to know: Replacement filters cost about $140 a year, and the three-stage unit takes up more cabinet space than simpler models.
See on AmazonBest value: Culligan EZ-Change Level 3 Under-Sink Drinking Water Filtration System US-EZ-3
Good Housekeeping names this its best-value pick: it costs less upfront and uses one compact filter with a simple twist-on replacement. Its certified contaminant reduction includes lead, mercury and cysts, while reducing chlorine taste and odor. The included mounting hardware and water-supply adapter make setup more complete out of the box. The single-filter design saves cabinet space, and reviewers cite replacement costs of roughly $70 to $80 a year. Its 400-gallon capacity is lower than the Aquasana’s, making it a better fit for smaller households. It is not certified to NSF 401 for pharmaceuticals, herbicides and pesticides.
Good to know: It covers fewer contaminant categories than the Aquasana and its filter has a lower capacity.
See on AmazonCheapest that's still good: Express Water RO5DX Reverse Osmosis Filtration System
Bob Vila’s testers rated it 5/5 for performance and value, recommending it as their best bang for the buck. It is a full reverse-osmosis system with broad stated contaminant coverage, including lead, arsenic, fluoride and dissolved solids. In home testing, reviewers said it reduced trace chemicals and water hardness, and gave it 4.5/5 for taste. The system includes several installation options and supports add-on filters, but it uses substantial under-sink space. Filter life varies by type, from six to twelve months. Reviewers noted the water may stay cloudy for as long as two weeks after installation, so it’s not the best pick if you need a compact or quick-to-set-up system.
Good to know: It is bulky, and reviewers warn the water may remain cloudy for up to two weeks after installation.
See on AmazonHow we chose
Good Housekeeping assessed installation, filter changes, certifications and flow, including months of home use for its top pick. Bob Vila installed and used four reverse-osmosis systems at home for periods ranging from one week to nine months, checking water with test kits and assessing taste and se Danilli read the reviews and tests listed below and compared current prices; it does not take money from brands to pick a product.
Sources
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Written with Danilli's AI from the sources above and refreshed about once a month; prices change, check Amazon for today's price. Danilli may earn a small commission from Amazon or the store when you buy through these buttons. The price is the same for you. Pictures marked "picture by AI" are made by Danilli's AI to show the product; check the real photos on the store page.