Give your Bestway pool its best performance by using the Bestway Filter Cartridge Type IV / B. Filter the water in your pool to keep it attractive and refreshing all season, it is recommended to change the filter regularly. This shrink wrapped with litho label, direct and brand new from Bestway and is manufactured with Dacron filament media. Reusable filter optional after a hose down cleaning and wouldn't need to be replaced until it shows signs of wear or deterioration Replacement cartridge for: 7,949 L (2,100 gal.); 9,463 L (2,500 gal.) per hour filter pumps. Keep your pool water clean and crystal clear with the help of the included Bestway Flow Clear 2,500 GPH Above Ground Pool Filter Pump. This filter pump fits most above ground pools, and includes adaptors for pool valves with an outer diameter of 1.25 inches. With a flow rate of 2,500 gallons per hour and integrated pool system flow rate of 1,900 gallons per hour, this pump has the power to filter pools up to 15,200 gallons in size. For the long life of your pool, invest in quality equipment and take care of your water with the Bestway Flow Clear 2,500 GPH Above Ground Pool Filter Pump.