Function: 1. Excellent filtration effect: The density of the product increases, the filtration effect is improved, and the product is not easy to move under the influence of water flow. 2. Grease absorption: sponge properties make it absorb fat in the filtration process, and other filter elements have the same effect, can achieve good filtration. 3. Washable filter: they can be washed and reused many times, they can be washed with water and reused after drying. They will provide you with the convenience of use. 4. Small size: the filter is lightweight, easy to carry. It does not take up much space and users can easily take it wherever they need it. 5. High-quality material: high-quality sponge material, using strict production process, can effectively filter impurities, is your ideal choice. Specification: Item Type: Swimming Pool Filter Sponge Weight: 50g/1.8oz Material: sponge Product Size: 102x90x30mm/4x3.5x1.2in Take the opportunity: swimming pool Package List: 4 x pool filter sponge