AQUASTRONG Pool Filter Balls for Sand Filters, Replaces 150 lbs Pool Filter Sand, Pool Filter Media Balls for Swimming PoolsEfficient 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 3. 1 lbs to 4. 6 lbs Filter Balls Replace 50 lbs to 150 lbs of Sand: These fiber filter balls are a lightweight and more effective alternative to traditional