Hayward S180T92SFT 18-Inch Pro Series Sand Filter System with 1 HP Matrix Pump and valve 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 Power-Flo Matrix pump, valve and 1-horse power; measures 18-inch size