The Aquamira "Backcountry" Replacement Filter, sometimes known as the Series IV GRN Line bacteria filter, is the ideal choice for water filtration when you're in the outdoors where stream, river or lake water may contain pathogenic organisms such bacteria, Cryptosporidium and Giardia.

This filter is certified to provide protection from water contaminants that you may encounter out on the trail for 100 gallons of use. It can used used in any Series IV systems (Frontier Max inline filtration system or SHIFT vacuum insulated water bottles). They're made in the USA, and they're BPA free, chemical free and iodine free.

Enjoy great tasting water when away from your normal water supply without exposing yourself to possible harmful health effects. For the optimal hydration system, use a Backcountry filter with the Frontier Max casing with a pressurized Aquamira hydration reservoir for pressure-assisted filtration on demand.

NOTE: Orders over $99.00 qualify for free shipping within the continental U.S.