The BioStyle 30 ppi Biological Filter Foam provides 2-in-1 filtration by catching debris and by promoting growth of beneficial bacteria. This mechanical and biological filtration results in cleaner, healthier water for your aquarium inhabitants. These replacement filter foams fit inside the filter chamber of the BioStyle Power Filter series.
The quantity of foams that can fit in a BioStyle unit depends on the size of the filter. The filter foam should be replaced after 12-18 months, depending upon aquarium size, number of fish and plants, and declines in filter performance. Box includes four 30 ppi filter foams.