The world's most-advanced bio filter media, Savio Springflo, has a handy new storage bag making it possible to use this remarkable hybrid technology in a variety of filters. It's so easy to use - simply stuff the bio filter media into the mesh bag -and toss into your filter. Specifically designed to update any old-style filter still operating with outdated bio-balls, lava rock, or filter mat. Improves the efficiency of your old filter and makes cleaning effortless. (Savio Springflo sold separately.)