Guardian Purifier

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The world’s most advanced backcountry purifier; treats viruses, bacteria, and protozoa.

Nothing is safer or easier to use for purifying the most demanding backcountry water sources than the MSR Guardian Purifier. Originally designed for military squads, the Guardian brings highly advanced technology to global travelers, backcountry users, and those stocking emergency kits. Fast and easy to use, this pump purifier offers the added viral protection you need when traveling in developing nations and popular wilderness areas. Its advanced hollow fiber filter offers the most reliable way to purify even filthy water conditions. Add its long-lasting performance and revolutionary self-cleaning ease, and this may be the only treatment device you’ll ever need.

for California customers: Can expose you to styrene, which is known to the State of California to cause cancer. For more info, visit


Brand Name:
Mfg Sku/Part Number:
490 g (17 oz)
8.25 x 4.5 in.
Micron Rating:
0.02 microns
Flow Rate:
2.5 liters/min
Cartridge Life:
10,000+ liters
Country of Origin:
Made in the U.S.A. of U.S. and Imported Materials
Protects Against:
• Viruses: Norovirus / Norwalk, Rotavirus, Hepatitis A virus
• Bacteria: E. coli, Shigella, Salmonella, Cholera
• Protozoa: Giardia, Cryptosporidium, Amoebae
• Particulate: Sediment, Silt, Dirt
Other Features:
  • Ultimate Protection: Meets NSF protocol P248, testing standard used by U.S. military, for removal of viruses, bacteria, protozoa, and sediment from “worst-case” water conditions.
  • Fast & Easy: Pumps a rapid 2.5 liters per minute, offering added viral protection without the need for chemicals, bulbs, batteries, or waiting.
  • Self-Cleaning: Pump self-cleans on every stroke, providing consistently fast flow rates with zero hassle—no backflushing or filter-scrubbing ever required.
  • Long-Lasting: Leading-edge hollow fiber cartridge treats up to 10,000+ liters.
  • Extremely Durable: Engineered to withstand heavy use, freezing, drops*, and harsh environments.
  • Fits 63mm Bottle Openings: Screws on to wide-mouth bottles and reservoirs such as Nalgene, Klean Kanteen and MSR

*Withstands MSR water lab drop testing: 6 ft. to concrete.

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