Hollow polypropylene filter balls, can be filled with carbon, phosphate remover, etc., to perform biological and chemical filtration simultaneously. Suitable media include Supra Carbon, order code 428.0?, or carbolit, order codes 11511 ¸ 11516, and antiphos, order codes 11630 ¸ 11636. Sold in 25l boxes, containing c. 300 Multiballs.
