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MSR Guardian Purifier

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The MSR Guardian is the world’s most advanced backcountry portable water filter.

Nothing is safer or easier to use for purifying the most demanding backcountry water sources than the Guardian purifier. Originally designed for military squads, it brings this highly advanced technology to global travellers, 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 fibre 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.


  • 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 litres 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 back-flushing or filter-scrubbing ever required.
  • Long-Lasting: Leading-edge hollow fibre cartridge treats up to 10,000+ litres.
  • Extremely Durable: Engineered to withstand heavy use, freezing, drops*, and harsh environments.
  • Field cleanable: Yes
  • Field maintainable: No
  • Mechanical advantage: Yes
  • Water Bottle Adapter: Yes
  • Cartridge replacement indicator: Yes



  • Manufacturer: MSR

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Par L.

MSR Guardian Purifier: finally a water filter that checks all boxes

I teach survival and bushcraft courses, and spend as much time as possible outside, and I have been using water filters in the outdoors since the 1980's, and they have all been "better than none": slow, demanding frequent maintenance and fragile. Finally there is one that is fast, self-cleaning, easy to use and can handle drops and freezing. The fact that it is more capable -- i.e. removes viruses! -- than the old one it replaces it is icing on the cake.

Jan K.

Best of all!

This is my 2:nd MSR Guardian, been around the globe. It´s the best purifier of them all!


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