Get clean, healthy water by reducing 89 contaminants including chlorine, chloramine, lead, pesticides, PFOA/PFOS, cysts, microplastics, and more.

Replacement filters for the A O Smith Reverse Osmosis System (AO-US-RO-4000)

Use only certified, genuine A O Smith replacement filters for continued contaminant removal and system performance

Claryum® Filtration Technology is obsessively engineered, combined filtration technology that reduces harmful contaminants – those you can see, smell and taste, and those you can’t – providing you with optimally clean water

WQA certified to NSF/ANSI to Standards 42, 53, 58, and 401

Replacements made easy - no plumber necessary

Includes one Claryum® Filter and one Carbon Filter

Replace filters every 6 months