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Guardian
Purifier
The world's most advanced portable purifier
With military-grade engineering and game-changing technology, the Guardian Purifier is simply the safest, easiest way to purify water virtually anywhere on earth.

2.5 Liters
Per Minute
Treats up to
10,000 + L
Self-cleaning
Performance
Popular Science Best of What's New The MANual Best of the Show Gear Institute Best New Gear Gear Caster Innovation Award Outside Gear of the Show National Geographic Gear of the Year Men's Journal Gear of the Year Gear Junkie Best in Show Gear Junkie Top Gear Pick OutDoor INDUSTRY AWARD (Gold Winner) Backpacker Editors Choice Retki Magazine Award
MSR Guardian Filter
Ultimate Protection
Physically Removes
Viruses

Like:
Norovirus / Norwalk
Rotavirus
Hepatitis A virus

Bacteria

Like:
E. coli
Shigella
Salmonella
Cholera

Protozoa

Like:
Giardia
Cryptosporidium
Amoebae

Particulate

Like:
Sediment
Silt
Dirt

In One Easy Step
NSF Protocol P248
Fast. Simple. Safe.
Rapid
2.5 liters per minute
Rapid Stats
Full Viral
Protection
No more chemicals, prefiltering, bulbs, batteries or waiting
Revolutionary Self-Cleaning Performance
No backflushing or filter-scrubbing ever
Treats Up To
10,000+ L
10 years
x 60 days/year
x 4 people (4L/person/day)
= 9600 Large Water Bottle
Rugged Construction
Snowflake representing 0 degrees celsius- Brr!
0°C
Withstands
freezing
&
drop testing
6 ft. to concrete, as conducted
by the MSR water lab
Indication of a fall
Our game-changing
hollow fiber technology
Unlike conventional hollow fiber technology, these advanced medical-grade fibers block viruses, the tiniest waterborne microbiological threats.

Made in the U.S., these fibers are also more durable than others. They’re not damaged by freezing, and in our water lab, the purifier withstood drop testing.*
GIF Image of Hollow Fibers in action
GIF Image of the Guardian in action
The Only Pump That Self-Cleans
On every stroke, the purifier uses 10% of its water to flush the contaminants in its filter back into the source. This means, you’ll never hassle with backflushing or scrubbing cartridges to maintain its fast flow.

*MSR water lab drop test: 6ft to concrete
Behind the
Guardian Purifier's Creation

Seeking a way to protect Service Members from waterborne illness anywhere on earth, the U.S. military turned to MSR’s world-renowned water research lab. After six years of extensive R&D, engineering and funding, the solution became the Guardian purifier.

Now, this state-of-the-art water treatment device is available to you.

Enjoy your MSR Guardian

Trust Your Adventures to the World’s Most Advanced Backcountry Purifier