Hayward CX1280XREPAK4 525 Square Feet Replacement Cartridge Element for Pool, Hayward SwimClear Filter Model C5030, White, 4 Pack. NEW – Very small cracks on two (See Pics) – WILL NOT IMPACT PERFORMANCE. Get at a discount! 525-Square feet cartridge element replacement. Fits Hayward SwimClear in-ground cartridge filter model C5030. It includes 4 cartridge per pack. This cartridge elements maintain pool water cleanliness and clarity. Specifically designed for maximum performance of hayward cartridge filters.