Aquamira GRN Series III Frontier Pro 67106Replacement 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