W3C4030, previously C4030.
The Hayward SwimClear™ large capacity cartridge filter series offers increased filtration area for a bigger, better clean. Utilizing a cluster of four reusable cartridge elements, SwimClear filters offer a choice of 225, 325, 425 or 525 square feet of heavy-duty dirt-holding capacity for extra-long cleaning cycles. With filter tanks constructed of improved reinforced thermoplastic material, SwimClear filters will provide years of trouble-free operation and crystal clear, sparkling water-all season long.