The MSR Guardian is a pump-action expedition purifier that physically removes viruses, bacteria, and protozoa via a hollow-fiber filter that meets the US military's NSF P248 protocol. 2.5 liters per minute throughput. Self-cleans on every stroke by routing roughly 10 percent of pumped water through the filter to back-flush, so there's no maintenance kit to carry. Rated to survive freezing and a 6-foot drop. 1 lb.
MSR
Guardian Purifier
Shipping
$400
1 retailer
At a glance6 specs
treats
Viruses, Bacteria, Protozoa, Particulate
weight
1 lbs
drop rated ft
6
flow rate lpm
2.5
self cleaning
Yes
filter life
10000 L
Where to buy
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Description
Last reviewed May 15, 2026
Full specifications
7 fields
| treats | Viruses, Bacteria, Protozoa, Particulate |
|---|---|
| weight | 1 lbs |
| drop rated ft | 6 |
| flow rate lpm | 2.5 |
| self cleaning | Yes |
| filter life | 10000 L |
| meets us military p248 | Yes |
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