A.O. Smith AO-WH-PREV whole house water filter provides cleaner water throughout your entire home. It effectively reduces rust, soil, and silt while being compatible with both community and private well water sources. This filter has a long lifespan of up to 6 months, and is easy to install and maintain. A simple twist of the valve allows you to switch between filter and bypass modes, and the clear housing lets you see when it's time to replace the filter.