Hayward SwimClear™ W3C3030 325 SqFt Cartridge Filter 50 psi 122 gpm. SwimClear cartridge filters provide the most energy efficient flow and save up to 2,500 gallons of water per year by eliminating the need to backwash. SwimClear filters offer a choice of 225, 325, 425, 525 and 700 sq. ft. of heavy duty dirt holding capacity and extra-long filter cycle.