Longer lasting appliances- whole house filter system designed to reduce sediment from every tap

The included reminder timer tells you when it is time to change your filters while the built-in pressure relief button allows for easier filter changes

Whole house filter system can be used as a stand-alone system or with additional A O Smith filtration systems

Certified to reduce sediment, scale, dirt and rust in your water, appliances and plumbing fixtures

Universal 4.5-in replacement filter cartridges sold separately (AO-WH-PREL-RP, AO-WH-PREL-RPP, AO-WH-PREL-RCP, AO-WH-PREL-R, AO-WH-PREL-RC)

System is NSF Certified to Standards 42

Includes filter housing, housing wrench, reminder timer and all parts necessary for installation

Perfect for a household size of 4+ people

Limited 1-year warranty