Keep your pool water clear and clean with a Filter Cartridge (Type III, Type A/C) by Bestway. This replacement cartridge measures 10.6 cm x 20.3 cm (4.2 in x 8.0 in) and is designed for 5,678 L (1,500 gal.) per hour filter pumps. They are easy to clean and sift dirt and debris out of your pool with your pump. Bestway recommends replacing them every 2 weeks for best results.