Aquamira/Frontier Replacement Filter Cartridge: Max (GRN-IV-100)

Customize the Frontier Max with the replaceable Series IV GRN Line Bacteria Filter. The Series IV GRN Line filter offers light weight, high flow thirst protection from the most common causes of waterborne illnesses including bacteria, Cryptosporidium, and Giardia. An ideal choice for backcountry use, the GRN Line provides cost effective protection when virus is not a concern.