AQUASTRONG Pool Filter Balls for Sand Filter Pump, 4.6 lbs Reusable Sand Filter Balls (Replaces 150 lbs Pool Filter Sand), Efficient Blue Filter Balls for Swimming Pools, Filter Pumps, AquariumsBrand: AQUASTRONG Color: Blue(Pro+) Features: Efficient Filtration: AQUASTRONG Pool Filter Balls offer superior performance compared to traditional sand, capturing impurities as small as microns. They effectively trap more debris, ensuring crystal clear water, improved circulation, and reduced maintenance for a hassle free pool experience 4. 6 lbs Filter Balls Replace 150 lbs of Sand: These fiber filter balls are a lightweight and more effective