HWD 225sqft SwimClear Cartridge Filter 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, up to an entire season without cleaning! With filter tanks constructed of improved PermaGlass XL™ material, SwimClear filters will provide years of trouble-free operation and crystal clear, sparkling water-all season long. Features High capacity, rapid release manual air relief valve bleeds air with a quick quarter turn of the lever Filter tanks made from durable glass reinforced copolymer to meet the demands of the toughest applications and environmental conditions, including in-floor cleaning systems Self-aligned tank top and bottom make access to servicing the Quad-Cluster™ cartridge elements fast and simple Heavy-duty, tamper-proof one-piece clamp securely fastens tank top and bottom. Allows quick access to all internal components without disturbing piping or connections Non-corrosive top closure plate prevents elements from lifting and allowing unfiltered water to by-pass into pool or spa during operation Quad-Cluster™ of high-quality polyester cartridge elements provide 225, 325, 425 or 525 square feet of filter area for extra dirt-holding capacity and long, long filter cycles 2" full-flow internal piping and plumbing for less resistance to flow and maximum performance PVC union coupling connection accepts 1 1/2" or 2" piping for plumbing versatility Full size 1 1/2" integral drain allows for fast, 100% clean-out and easier flushing of tank