Poly-Flo™ - Filter Media
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Poly-Flo™ Rainbow BioBloxPoly-Flo™ Rainbow BioBloxPoly-Flo Rainbow BioBlox are an amazing solution for filter media. With more than 500 square feet of surface area in a 1 cubic foot box, you really get a lot for less! BioBlox can be used in most any biological filter.