The most critical component of every residential water treatment system is the control head. Without control heads your system would never be able to regenerate or backwash. Regenerating is required to recharge the resin bed. Backwashing is necessary to raise the media bed and flush out the trapped elements in the tank and flush them down the drain. We recommend Pentair control valves because they have a large number of designs to choose from, they are made in USA from the finest materials, they are high quality, and have sleek, modern design features.