Keep your swimming pool or spa clean and sparkling with the Unicel C8409 Replacement Filter Cartridge. This cartridge features 90 square feet of 100% polyester Reemay material, providing high performance filtration and excellent dirt-holding capacity. Designed to withstand the rigors of regular cleanings and chemical exposure, this filter cartridge is compatible with various pool systems including Hayward, Sta-rite, and Waterway. Easy to maintain with regular cleaning, this filter cartridge ensures optimal filtration efficiency and a longer lifespan for your pool or spa.