Intex Krystal Clear Sand Filter Pump, typically used for above-ground pools. Helpful information includes: It uses sand as a filter medium, which needs replacement approximately every 5 years. The pump has a 6-way valve for functions like filtering, backwashing, rinsing, recirculating, draining, and closing. It features a 24-hour timer with preset cycles for automated operation. The pump includes Hydro Aeration Technology for improved water clarity and circulation.