Hayward Sand Filter System & Tank 21" 1 1/2 Hp - Systems are designed for quick assembly and precise alignment of components Pumps and filters are performance-matched to provide maximum flow and energy efficiency Filter bases are molded of rugged ABS for lon-lasting, all-weather performance 7-position PermaGlass XL Vari-Flo valve provides maximum flow at low pressure drop 1 1/2 hp Power-Flo Matrix pump