Intex - 6 S1 Filter Cartridges - For Intex Purespa Bubble & Jet Massage Spas

3 x Twin Packs (6 Filter Cartridges)The S1 Cartridge Filter is sure to keep your PureSpa™ 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 once a month or sooner.Suitable for PureSpa Bubble, model SSP-20 (Item 28402) and PureSpa Jet Massage, model SSP-H-20 (Item 28422)