Savio Springflo Biofilter Media ribbon encourages better adhesion and proliferation of bacteria using a special formulation of polypropylene and calcium carbonate. The textured surface is embossed with millions of dimples to rapidly secure and develope beneficial microorganisms. it does not clog and resists channelling and compation in upflow and horizontal flow pressurefilter chambers. Negative buoyancy keeps it in place. Over 180 sqft per roll.