MJZ Pool Filter Balls for Sand Filter, 3.1 Lbs Reusable Sand Filter Balls for Swimming Pools, Efficient Eco-Friendly Polysphere Pool Filtration Balls, Pool Filter Balls Media for Sand PumpBrand: MJZ Color: White Features: Upgraded Pool Filter Balls: These pool filter balls for sand filter can perfectly replace traditional filter sand, providing excellent filtration effects. Our polysphere pool filtration balls are more environmentally friendly, lightweight, and effective than filter sand, and will not clog your filter, reducing the cleaning and maintenance work of the filter. 3. 1 pound pool filter balls are equivalent to the filtering