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Original Intex Type S1 Pool Filter Cartridges - Pack of 12. The S1 pool cartridge filter keeps the jet massage water in your PureSpa pool clean and fresh. Made from easy to clean and durable Dacron paper for the ultimate filtration. For maximum efficiency, clean the cartridges every week and replace them once a month or earlier Each filter measures 7.6 x 11.4 cm. Works with all Intex PureSpa models, including 28403E, 28407E, 28443E, 28453E, 28421E, 28423E, 28413E and 28453E.; Product description BUY TOGETHER AND SAVE - Six pairs of Intex Type S1 Spa Filter Cartridges (Twelve Cushions). The authentic replacement cartridge for your Intex Pure Spa. Give your Intex Pure Spa its best performance by using the genuine Intex brand, easy to clean Dacron filter material. Replace your filter cartridges regularly every two weeks to maximise the performance of your spa!; Product description BUY TOGETHER AND SAVE - Six pairs of Intex Type S1 Spa Filter Cartridges (Twelve Cushions). The authentic replacement cartridge for your Intex Pure Spa. Give your Intex Pure Spa its best performance by using the genuine Intex brand, easy to clean Dacron filter material. Replace your filter cartridges regularly every two weeks to maximise the performance of your spa!; BUY TOGETHER AND SAVE - Six pairs of Intex Type S1 Spa Filter Cartridges (Twelve Cushions). The authentic replacement cartridge for your Intex Pure Spa. Give your Intex Pure Spa its best performance by using the genuine Intex brand, easy to clean Dacron filter material. Replace your filter cartridges regularly every two weeks to maximise the performance of your spa!