【Premium Material】: Type S1 spa filter is made of high-quality sponge, the foam filter has good flexibility and high elasticity. Dimensions: 10.6 x 7.3 cm. Center hole: about 4 cm. Designed for Intex S1 filters, can be washed and reused multiple times. 【Good Filtration Effect】: Foam filter has a high-density mesh structure. This can filter many impurities in the pool, it can effectively remove leaves, grass, hair, scores, pine, insects and other floating debris. 【Easy to Maintain Changing】: Changing your filter cartridge is part of your routine pool maintenance and regular cartridge replacement can be quite expensive. Our sponge filter is washable, easier to clean and maintain than traditional paper filters. 【Easy to Clean & 【Reusable】: Washable pool filter sponge, soft, not easy to deform, fast filtration speed, good breathability, can be used for a long time. Filter Simply remove the filter from the pump and rinse off the dirt with a garden hose. Be careful not to wipe roughly or