Function: Swimming Pool Sponge Cartridge Filter Can filter most impurities, pollutants, etc. Keep your swimming pool clean. Compatible with B swimming pool sponge filter. Replaceable washable sponge pool filter has good flexibility and ductility. filter can be reused after being washed many times and has a long service life. Low cost: Regular replacement of the filter elements as a maintenance of the swimming pool may cause high expenses. These washable sponge pool filters can effectively reduce your costs. Material: high-quality sponge, which can be used repeatedly for a long time. It is recommended to replace the Washable Foam Hot Tub Filter once a week, that is, after cleaning once a week, put it back. Application: Compatible with foam and jet pure spa swimming pool, bathroom, fish tank. Type: Type B Filter Sponge Material: Sponge