“Our drinking water is so much better.
And we are happy to have the water on hand instead of having to buy bottled water.
— Catherine G, OH
Reverse Osmosis Water Filters
Upgrade to Cutting-Edge Filtration
Target a broad range of potential contaminants and enjoy a virtually unlimited supply of worry-free drinking water with Culligan reverse osmosis (RO) systems.*
Why Choose Culligan Water Filters For Your Sink
With easy installation, space-saving designs and smart features available, Culligan under sink water filters for your home provide the ultimate drinking water upgrade.
Reduce More Than 90 Contaminants
Culligan reverse osmosis systems are certified to reduce 18 times more contaminants than the leading standard filter pitcher.**
40 Billion+ Bottles Saved
Culligan water filtration solutions make an eco-friendly impact by reducing plastic bottle waste.
Smart Features Available
Get filter change alerts, track contaminants reduced and view plastic bottles saved through our app.
Reverse Osmosis Systems for Your Home
Filter products by category below.
Not What You’re Looking For?
Want to tackle problem water issues that impact cleaning, laundry and bathing, too? Ready to put an end to hard water headaches? See how Culligan whole house filtration systems and water softeners can help address your water concerns.
Reverse Osmosis Product Reviews
Under Sink Water Filtration Benefits
Get a virtually unlimited supply of cleaner, safer, great-tasting drinking water for pennies a glass with an under sink filter.
01
Customizable Filtration
Culligan RO systems have up to seven stages of filtration and 12 interchangeable filters.
02
Long Filter Life
With filters that can last up to two years, maintenance is simple and worry-free.
03
Third-Party Certified
Culligan systems are tested and certified by third-party organizations to ensure they meet the highest of industry standards.
04
Filtered Water on Tap
Get filtered water directly from your existing faucet with the ClearLink PRO™ accessory.
Never Question Your Water Quality
Start enjoying the benefits of cleaner, safer water in your home with help from your local Culligan water expert.
Compare Reverse Osmosis Water Filters
Unsure of the best reverse osmosis system for your home? Learn how these systems work, then review the comparison chart below to help determine which one may be right for you.
Select and compare two products.
Aquasential® Smart RO Drinking Water System
Aquasential® RO Drinking Water System
Aquasential® Tankless RO Drinking Water Filtration System
AC-30 Good Water Machine®
 Aquasential® Smart RO Drinking Water System |  Aquasential® RO Drinking Water System |  Aquasential® Tankless RO Drinking Water Filtration System |  AC-30 Good Water Machine® | |
|---|---|---|---|---|
Benefits System Features | ||||
World’s most efficient RO system¹ | ||||
Compatible with ClearLink PRO™ wireless filtration control | ||||
Advanced filtration for lead, arsenic, pharmaceuticals, microplastics, PFAS and other emerging contaminants | ||||
Space-saving tankless design | ||||
See water usage and system performance via app | ||||
Can alert you and your dealer to service needs and filter changes via app | ||||
Track single-use plastic bottles and money saved through app | ||||
Certified to reduce more than 70 contaminants, plus 15 emerging contaminants | ||||
NSF Protocol P231 certified for virus and bacterial reduction | ||||
Hear What Customers Say
There is a huge difference because the quality of the water now is so much better.— Jose R
Reverse Osmosis Frequently Asked Questions
What is an under sink water filter?
Under sink water filtration systems are installed underneath your sink to filter your drinking water. They typically offer more in-depth filtration than faucet-mounted water filters. For under sink water filters, you can choose to install a second tap for your filtered water, or, with Culligan’s unique ClearLink PROTM technology, you can switch from filtered to non-filtered tap water with the press of a button.
What is reverse osmosis water filtration?
In reverse osmosis water filtration, water flows across a tightly woven membrane that separates the water from contaminants as small as a single atom. Typically, the reverse osmosis process is combined with multiple other stages of filtration including a sediment filter, carbon filtration, and additional speciality filtration stages.
Why get a reverse osmosis under sink water filtration system?
You can get a virtually unlimited supply of cleaner, safer, better-tasting water right from the tap. With multiple stages of filtration, these systems are one of the most comprehensive ways to treat your water for a wide variety of potential problems.
How long do reverse osmosis filters last?
The lifespan of your filter depends on a number of factors including how much water you use, your local water quality and the specific RO system you choose. Regularly replacing your filters will help ensure your system is running at full capacity. Some filters should be changed annually, but others can last up to two years. The reverse osmosis membrane should be checked annually and typically lasts three to five years.
How do reverse osmosis filters work?
Reverse osmosis filters contaminants from water by forcing them through a semipermeable membrane. Some of these contaminants include lead, mercury and chromium, among many others.
What contaminants does reverse osmosis remove?
Reverse osmosis water filtration systems can target many contaminants, including arsenic, chlorine, lead, and PFAS. Some of these require specific filters to be included within the system, so make sure to find a system that can address the problems you’re most concerned about. Your Culligan water expert can help you understand the best solution for your home during your free consultation.
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Schedule Your Free Water Consultation
Our Culligan water experts are ready to help you find the right solution for your problem water. We offer a free in-home water test, or we can schedule a phone consultation (you can select your choice in the next step).
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