Replace your filter cartridges regularly for the best results. It is recommended that you replace cartridges every 2 weeks to maximize your spa's performance.
 3. Product Dimensions 7.5 cm ,  10.8 cm 4.
The S1 Cartridge Filter is sure to keep your PureSpa Jet Massage water clean and fresh
5. It is made with easy-to-clean, heavy duty Dacron paper, for the ultimate filtration
6. For maximum efficiency, clean cartridges each week and replace once a month or sooner
-Part #: 29001E