Intex Filter Cartridge A Twin Pack is designed for above-ground pools and fits various Intex filter pumps. Filter cartridge is made with easy-to-clean Dacron paper, and is 8" H x 4.25" Dia. Fits Intex pumps with flow rates of 500, 530, 800, 1000, and 1500 gallons per hour. It's recommended to replace the filter every two weeks to keep your pool water clean and clear.