Frontier Replacement Filter. Virus rated filter provides maximum protection from virus, bacteria, Cryptosporidium and Giardia with up to 600 ml/minute flow rate. Designed for use with any Frontier Flow Water Bottle (67015, 67026). Miraguard Antimicrobial technology suppresses the growth of bacteria, algae, fungus, mold, and mildew within the filter media. Filters 120 gallons. Hang packaged.