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Get high volumes of purified, virus-free water on-demand virtually anywhere with the MSR® GuardianTM Gravity Purifier. This high-volume gravity system makes it easy to clean water at basecamp, remote villages, or anywhere you need purified water for a group of people. Just hang the 10L reservoir, fill it with water from the sink or river, and let the Advanced Hollow Fiber filter remove viruses (99.99%), bacteria (99.9999%), protozoa (99.9%), sediment and microplastics.
The two-stage purifier also includes activated carbon to reduce unpleasant tastes and odors, so your water tastes delicious with every swig. No backflushing required. Simply opening the purge hose flushes the system to clean it and maintain flow. Originally designed to protect service members in the field, this rugged purifier handles the abuse of travel and meets the NSF P248 military testing standard.
NSF Protocols P231 & P248
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. The GuardianTM Purifiers are the market's only to pass the military standard P248 testing for virus removal.