A.O. Smith AO-WH-PRE is a whole house sediment filter that effectively reduces rust, soil, and silt for improved water throughout your entire home. It is designed for cold water lines only and has an operating pressure range of between 25 psi — 100 psi. The filter head, opaque housing, and housing wrench are included in the box. It is recommended that you change the filter every six (6) months, or earlier if there is a significant drop in water pressure. The exterior of your filtration system can be cleaned with warm, soapy water. Rinse well with fresh, clean water.