The filter cartridges are suitable for filter pumps with a capacity of 2,006 to 3,028 litres per hour and help to keep the water permanently clear. For best results, Bestway recommends changing the filter cartridge every two weeks. Your pool will be clearer than ever with the Bestway filter cartridge. This replacement cartridge is designed for filter pumps 220-240V~/12V~ with capacities of 2,006 litres (530 gallons) and 3,028 litres (800 gallons) per hour. Contents: 2 pieces.