Abstract: A filtration cartridge, for purifying biologically contaminated liquids, comprised of a framework having a plurality of voids and abundant surface area extensions and forming a cavity(s) for insertion of filtration materials. The cartridge framework is permanent and its surface area provides colonization sites for the propagation of water purifying microorganisms responsible for biological filtration. The cavity(s) accepts filter media that add additional functions such as mechanical and/or chemical filtration or other media that enrich or modify the chemical composition of the liquid being treated.

Abstract: A filtration cartridge, for purifying biologically contaminated liquids, comprised of a framework having a plurality of voids and abundant surface area extensions and forming a cavity(s) for insertion of filtration materials. The cartridge framework is permanent and its surface area provides colonization sites for the propagation of water purifying microorganisms responsible for biological filtration. The cavity(s) accepts filter media that add additional functions such as mechanical and/or chemical filtration or other media that enrich or modify the chemical composition of the liquid being treated.