Warning: California Proposition 65
The MSR Guardian purifier combines military-grade engineering and game-changing hollow fiber technology to create the safest, easiest way to purify water virtually anywhere on earth. Co-developed with the military, it brings this advanced technology to international travelers, backcountry users and for disaster preparedness. Game-changing hollow fiber media offers the most reliable way to remove pathogens - even viruses - from the filthiest water. Add self-cleaning performance, and this purifier shifts the paradigm.