INTEX Filter Cartridge 29007 (Type "H")Intex Filter cartridge Type ' H' this Intex filter cartridge is the type ' h' version which will fit the small 28601 and 28602 pumps typically found in 8ft and 10ft Intex pools. Filter cartridges fit inside your filter pump and catch dirt as it passes through the system. Intex suggest that you replace the filter cartridge every two weeks in the summer to keep the swimming water clean. Features: designed to fit Intex filter pumps 28601 28602 cartridges