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MSR Guardian Gravity Water Purifier



Why We Like The Guardian Gravity Water Purifier

The Guardian Gravity Water Purifier keeps us safely hydrated on our backcountry treks and while traveling abroad. The high-flow system filters up to 1 liter in 2 minutes, providing 10 liters of drinkable water by the time we've figured out where the smell in our hostel dorm is coming from. It's us. The smell is us.

  • High-flow, gravity-powered purifier packs small for backpacking
  • Winner of Backpacker 2021 Editors' Choice Award
  • Filters out bacteria, particulate, viruses, and protozoa
  • Simple cleaning for optimal taste and flow
  • 10L capacity provides all-day hydration for multiple people
  • Durable and effective to meet NSF P248 military testing standards
  • Top opening for easy fill and water bottle adapter for easy refill
  • Cartridge life indicator alerts you when it's time to change it
  • For optimal flow rate, hang the reservoir bag at least 6 ft. above the clean water receptacle
  • Item #MSQ001D

ultrafiltration hollow fiber, ABS (acrylonitrile butadiene styrene)
Purifying Element
Advanced Hollow Fiber
bacteria, particulate, viruses, protozoa
UF hollow fiber
Pore Size
0.02 micron
Cartridge Life
3000+ L
Field Cleanable
cartridge replacement indicator, water bottle adapter
[height x length x width] 4 x 12 x 4in
Claimed Weight
1lb 3oz
Recommended Use
backpacking, hiking, travel, camping
Manufacturer Warranty
limited 3 years

Tech Specs

What do you think about this product?



How to Use Your Guardian™ Gravity Water

Your Guardian Gravity Water Purifier harnesses the power of gravity to provide large volumes of safe, purified water on-demand. Here, we’ll walk you through how to setup and use your brand-new purifier.


MSR Guardian™ Gravity Water Purifier

The MSR Guardian Gravity Water Purifier delivers large volumes of safe, purified water on-demand, making it perfect for international adventurers and group campers seeking reliable viral protection and better-tasting water virtually anywhere on Earth. Using the revolutionary technologies of our original Guardian purifier, this gravity-powered sibling provides the viral protection that’s needed in developing nations and crowded local backcountries. Featuring military-grade engineering, a fast flow and a large 10-liter reservoir, the purifier makes it easy to cover your daily water needs, from drinking to cooking to hygiene, at both urban and backcountry settings.

>Rating: 1

Bag leaked, flow rate seems slow

I've used it several times

I purchased this right away as I own the Guardian pump version and not having to pump water would be awesome. I feel like the flow rate was very slow, likely due to water having to travel through a much tighter membrane in the purifier cartridge. The main problem was the bag leaked water out of the outlet and I was attempting to test it indoors. They show people using it in all sorts of places, but if you have a leaky bag that will be tough. I repeatedly contacted MSR support and never received a call back. It would have been nice if they were responsive.

Hi Jim - Sara here, MSR rep. Sorry to hear about your poor experience with the new Guardian Gravity. Our product and warranty teams would like to hear more about your experience and I'm sorry you haven't heard back from them. (Hopefully by now you have). Please reach out to Appreciate your support and feedback.