Tiny viruses are no match for the newest addition to the Frontier filter line. The Frontier Max Filtration system offers maximum RED Line thirst protection, smart design, and unrivaled compact, lightweight connectivity. Perfect for backcountry use, international travel and anytime contamination is a risk factor. This purpose-built filter adapts for use with bottles, hydration bladders, gravity-fed, and DIY systems when used with the included UQC connectors. The Frontier Max is all about connectivity and with the patented UQC (universal quick connect) system, you can connect easily to any hydration system, use as a straw with a bite valve, or create a quick and easy gravity fed filtration system. The ability to replace filter cartridges means you can taylor the filtration to meet your needs: RED Line for maximum protection, GRN Line for bacteria protection at high flows and lighter weight..