Give your Coleman swimming pool pump its best performance by using the Coleman Filter Cartridge Type III A/C. Filter the water in your pool to keep it attractive and refreshing all season. It's recommended to change your filter as regularly as every 2 weeks. This replacement cartridge is compatible for all Coleman brand pools with 1,000 GPH and 1,500 GPH pool filter pumps (listed below). It's also compatible with 1,000 and 1,500 GPH Bestway swimming pool filter pumps. (3 Pack) Coleman Power Steel Round Frame Pools compatible with Coleman Filter Cartridge: Part number 90337 (14 feet x 42 inches) 90321 (16 feet x 48 inches) 90323 (18 feet x 48 inches) 90331 & 13889 (22 feet x 52 inches) 90338 (26 feet x 52 inches) 90335 (18 feet x 9 feet x 48 inches)