This replacement pool filter cartridge set is designed for pools, spas, and hot tubs that use compatible 105 sq. ft. elements. The 4-pack uses trilobal pleated filtration fiber to capture hair, leaves, dust, debris, and other fine particles for cleaner water. Its high-permeability structure helps reduce flow resistance while supporting efficient pump operation. Reinforced end caps and center support improve durability, and the cartridges are easy to rinse clean for continued performance.