The Replacement Intex 29005E Type B Pool Filter Cartridge (12 Pack) is a must have accessory to the Krystal Clear Cartridge Filter Pump. This filter cartridge is made with easy-to-clean Dacron paper for the ultimate filtration. For maximum efficiency, replace cartridges every two weeks. Intex replacement cartridges are easy to clean and maintain. For best results, replace cartridge every two weeks. Replacement filters for 2500GPH Pumps. Models C2500 (FP633, FP634, FP634RC) and C2500 Model (633T, 634T, and 634RC). Filter measures 5-5/8 inch Diameter X 10 inch Height (with 1 7/8 inch cutout in center).