MSR Guardian Water Purifier for Backcountry Use, Global Travel, and Emergency Preparedness


  • Brand – MSR
  • Color – Smoke
  • Product Dimensions – 5.25″L x 5″W x 12.25″H
  • Material – Hollow Fiber
  • Capacity 2.5 Liters, 10 Liters
  • Included Components Water Purifier
  • Purification Method Hollow Fiber Membrane
  • Item Weight 2.19 Pounds
  • Model Name Guardian
  • Maximum Flow Rate 2.5 Liters Per Minute
  • Military-grade water purifier pump removes viruses, bacteria, protozoa, and particulate from contaminated water sources virtually anywhere on earth
  • Meets NSF protocol P248 testing standard of the U.S. military, using medical-grade fibers to provide protection from the tiniest waterborne threats
  • Pumps at a rapid 2.5 liters per minute, treats up to 10,000 liters of water, and withstands freezing, drops, heavy use, and harsh environments
  • Pump self-cleans on every stroke, providing consistently fast flow rates with zero hassle—no backflushing or filter-scrubbing ever required
  • Ideal for backcountry, expeditions, global travel, and survival; purifier pump measures 8.2 x 4.7 inches and weighs 17.3 ounces; made in the USA

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Secondarily, we also offer PayPal’s Buy Now Pay Later option. Simply choose PayPal as a payment method during checkout to pay for your order in multiple installments.

Please keep in mind that financing options are unavailable for 3rd party products.


The MSR Guardian Water Purifier Pump was originally designed for the U.S. Military, who turned to MSR’s advanced water filtration technology to keep troops safe and healthy in every remote corner of the globe. Six years of research and development went into engineering the pump purifier, which removes viruses (such as norovirus, rotavirus, hepatitis A), bacteria (such as E. coli. Shigella, salmonella, cholera), protozoa (such as giardia, cryptosporidium, amoebae), and sediment from contaminated water sources anywhere on earth. It meets the strict NSF protocol P248 testing standard for the U.S. Military, using medical-grade fibers to provide protection from the tiniest microbiological waterborne threats. Designed to be fast, simple, and safe, it pumps at a rapid 2.5 liters per minute, has a long-lasting advanced filter that treats up to 10,000 liters of water, and withstands freezing temperatures, drops, heavy use, and harsh environments. A self-cleaning mechanism ensures reliability, flushing contaminants in the filter back into the source, so there is no backflushing or scrubbing cartridges to maintain flow. The MSR Guardian Water Purifier Pump is ideal for wilderness, backcountry use, expeditions, global travel, and emergency preparedness. It measures 8.2 x 4.7 inches and weights 17.3 ounces. Made in the USA.

From the brand

From the manufacturer

guardian header

Mountain Safety Research

MSR has always been a company of engineers, inventors and unruly dreamers. Larry Penberthy started the company in 1969 on a personal crusade against unsafe equipment. Today, we’re still an intrepid team obsessed with creating the most reliable, high-performance gear possible.

Whether it’s defying the status quo in equipment design or radically shifting the social mindset, we believe the greatest innovations—and explorations—are inspired by the world’s unruly dreamers.

Photo By: Scott Rickenberger

Guardian Purifier



in use


Ultimate Protection

Meets NSF protocol P248, testing standard used by U.S. military for removing viruses, protozoa, bacteria and sediment.


Patent-pending system self-cleans with each stroke, eliminating the need to ever backflush or filter-scrub to maintain flow.

Fast, Easy & Long-Lasting

Purifies 2.5 liters per minute from nearly any source and treats up to 10,000 liters.

Rugged Construction

Stands up to heavy use and extreme environments; hollow fibers withstand freezing.

Water Lab

MSR Purifiers & Microfilters

From our fast-and-light microfilters to our gravity-powered systems, we apply the latest technologies and rigorous testing to assure you safe water on every adventure.

water lab

Safe Water Starts With Science

We invest in an on-site water lab with staff scientists, and individually test our devices to ensure they deliver greater safety and ease of use.

Every MSR filter and purifier features:

  • An integrity check that allows the user to easily confirm that, if the device is dropped or frozen, the fibers haven’t been damaged and the device is working safely—a feature most competitors don’t provide.
  • An end-of-life indicator—the filter media stops passing water. This clearly identifies that it’s time to replace the cartridge without exposing the user to harmful pathogens.
  • Passes NSF Protocol P231 throughout the filter’s life. The test confirms microbiological threat removal from a variety of water types, unlike NSF 42 and 53, which aren’t suitable tests for backcountry use.

Important information

Legal Disclaimer


Additional information

Weight 2.19 lbs
Product Purpose

Overland Hygiene



No Hassle