Hayward S180T932STL 18-Inch Pro Series Sand Filter System with 1-1/2 HP 2 Speed Matrix Pump Pro Series sand filter system is designed for quick assembly and precise alignment of system components Provides maximum flow energy efficiency and outstanding water clarity Filter base is molded of rugged thermoplastic for long-lasting, all-weather performance Features 7-position Vari-Flo valve provides maximum flow at low pressure drop Comes with 2 speed Power-Flo Matrix pump and 1-1/2-horse power; measures 18-inch size