SpringFlo Bio Filter Media's performance is unmatched. Unlike copies, this patented 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 develop beneficial microorganisms. It does not clog and resists channeling and compaction in up-flow and horizontal-flow low pressure filter chambers. Negative buoyancy keeps it in place.