Features: Washable and reusable: Our sand pool filter can be washed, you only need to use water to gently rub out the stains absorbed by media filters, please clean pool filter sponge balls regularly once a week to ensure the effectiveness of it. Easy to use: You just need to put these pool filter sponge balls in the sand pool filter tank of the swimming pool. There is no sand in the tank, which is more efficient than the traditional filter. Specification: Material: polyester fiber Color: as the picture shown Size: as the picture shown Note: Manual measurement, please allow a slight size error of the item.