Savio Springflo Bio-Filter Media is a polypropylene and calcium carbonate ribbon.
The embossed pattern creates millions of dimples to rapidly secure and develop bacteria. Easy to use and maintain, inexpensive, and resists channeling, clogging, and compaction in up-flow and horizontal flow environments. 180 square feet of surface area per box. Fills 2-3 cubic feet.
Each box is enough to filter approximately 1000 gallons.
The image (above) shows detailed image of Springflo media.
Ditty Bags (see below left) are great for holding Springflo Bio-Filter Media.