Replacement Filter. GRN Line Bacteria Protection. Helps to eliminate chlorine, improve water taste, and eliminate odors. Tested and certified to remove over 99.9% of bacteria and Cryptosporidium and Giardia cysts. Patented design includes unique Cap Strap™ cap system to retain the cap and protect the patented Bite Me™ valve from contamination along with providing a sure grip on the filter. Filter casings are constructed of high impact FDA-grade ABS plastic to assure long life even in harsh environments. UQC universal connectivity system allows connection to standard quick connect fittings, the draw tube provided with the system, any ¼” ID tubing such as hydration drink tubes, and 28mm threaded bottles such as Platypus and other light weight flexible bottles. Antimicrobial technology suppresses the growth of bacteria, algae, fungus, mold, and mildew within the filter media. Filters 50 gallons. Tactical/Military hang packaging.