Beckett Biological Filter Replacement W/Bio-Balls Filtration Media for Ponds, Waterfalls, and Water Gardens is designed specifically for use with Beckett FR and DP model pumps. Bio-filters efficiently process waste and clarify pond water by reducing ammonia and promoting beneficial bacteria. Beneficial bacteria feed on the organic material in the water that passes through the filters and bio-balls to keep your water clean and clear. Clean your filters regularly by submerging them into a bucket half-filled with pond water, gently massage and squeeze the foam. Gently submerge the bio-balls in the bucket removing any sludge or large debris. This ensures that the beneficial bacteria remain in the foam filter and the bio-balls. Bio-filters provide filtration for a cleaner and healthier pond environment. They efficiently process waste and clarifies pond water by reducing ammonia and promoting beneficial bacteria. This efficient filtration system creates the ideal ecosystem for ponds with fish. This kit includes 20 bio-balls, five foam filters, five strainers, and one bio-box. A pump is not included in this kit.