Intex 29001000000 B01DEMGBAI Intex-29001E PureSpa Type S1 Easy Set Pool Filter Cartridges, (6 Fil, 1-Pack, Blue Genuine INTEX type s1 filter cartridges A pair of s1 cartridge filters are sure to keep your pure spa jet massage water clean and fresh It is made with easy-to-clean, heavy duty Dacron paper, for the ultimate filtration For maximum efficiency, clean cartridges each week and replace at least once a month Manufacturer item : 29001E