Function: Swimming Pool Sponge Filter Can filter most impurities, pollutants, etc. Keep your swimming pool clean. Compatible with B swimming pool sponge filter. Features: Replaceable washable sponge pool filter has good flexibility and ductility. This foam 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 daily maintenance of the swimming pool may cause high expenses. These washable sponge pool filters can effectively reduce your costs. Material: Made of 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 Colour: Blue Size: height: 25.5cm/10in; diameter:14.5cm/5.7in Center Hole: 5cm/2in Package Contents: 3 x Filter Sponge Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.