Hayward SwimClear 150 Sq Ft Single Cartridge Filter | W3C150SHayward SwimClear 150 Sq. Ft. Single Cartridge Pool Filter W3C150S The Hayward SwimClear 150 Sq. Ft. Single Cartridge Filter W3C150S combines advanced engineering with effortless maintenance to deliver unmatched filtration performance for residential pools and spas. As the most efficient single element cartridge filter in its class, the SwimClear 150 captures fine debris for superior water clarity while maintaining exceptionally low head loss for