Askyli 3.1 lbs Pool Filter Balls for Sand Filter, Reusable Pool Sand Filter Balls, Efficient Blue Filter Media Balls, Suitable for All Sand Filter System (Equals 100lbs Pool Filter Sand)Brand: Askyli Color: Blue Features: High Efficiency Filtration: Pool maintenance will improve extremely after using these pool filter balls. They quickly capture dirt and particles in pool water, keeping pool water crystal clear. Cleaning and maintenance of filter will be greatly reduced, saving a lot of time and energy. They can clean tank well and reduce your workload. These filter balls for sand filter are truly an indispensable accessory for