A true game changer that makes almost any questionable water source safe to drink. This purifier means you don't need to carry chemical water treatment, or a UV purifier when you are in virus territory. It removes viruses, bacteria, and protozoa. And it back-flushes itself during normal operation, so it's a lightweight and convenient package for travel and expeditions.

Filters 2.5L per minute at 60-80 strokes per minute
Hollow fiber filter removing bacteria and protozoa
On every stroke, 10% of the water flushes contaminants from the filter back into the source, so no back-flushing or scrubbing cartridges
Withstands freezing
Drop tested from 6 feet to concrete, as conducted by the MSR lab
Includes storage bag and manual
Note: the quality of water will significantly affect the filter's life

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MSR GUARDIAN Portable Water Purifier