Description
Microorganisms in backcountry water can pose an immediate risk to your health. NSF P231 and P248 are the most rigorous scientific standards for proving a device safely removes these microbes from challenging wilderness sources. These standards confirm the device’s effectiveness throughout the entire life of its filter. All MSR filters pass P231 for removal of bacteria and protozoa, and our Guardian Purifiers are the market’s only to pass the military standard P248 testing for virus removal.
Product Overview
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