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MSR
Guardian Gravity Water Purifier

3.782608695652174 out of 5 stars
23 Reviews
$299.95
Color:Grey

Size:

Quantity


Why We Like The MSR 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.


Details

  • High-flow, gravity-powered purifier packs small for backpacking
  • 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
Material
ultrafiltration hollow fiber, ABS (acrylonitrile butadiene styrene)
Purifying Element
Advanced Hollow Fiber
Eliminates
bacteria, particulate, viruses, protozoa
Filter
UF hollow fiber
Pore Size
0.02 micron
Cartridge Life
3000+ L
Action
gravity
Volume
10L
Flow
0.5L/min
Field Cleanable
yes
Includes
cartridge replacement indicator, water bottle adapter
Dimensions
[height x length x width] 4 x 12 x 4in
Claimed Weight
1lb 3oz
Manufacturer Warranty
limited 3 years

Overall Rating

4 based on 23 ratings

Review Summary

1 Stars - 4 reviews
2 Stars - 1 reviews
3 Stars - 1 reviews
4 Stars - 7 reviews
5 Stars - 10 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?

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4 out of 5 stars

February 17, 2024

Gravity purifier Guardian

After reading The Road by Cormac MacCarthy I purchased both a Guardian and a Guardian Gravity Purifier. I figure that they will either not get used much or they will save lives in the long run. That said I now only have the Guardian Purifier as my Guardian Gravity Purifier was donated by me to a disaster relief friend. Now all I need is a sale for me to be able to buy my family another one.I am glad I helped someone but now I can't afford another one. I never even got to use it.

Yoshie H.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

4 out of 5 stars

November 14, 2023

No more pumping!

Great filter! Just check it first before taking into the field, my dirty water bag had a defect which made it leak at the port. I was able to fix this by jerry rigging it with my dromedary bag. Good that MSR uses standard connections. I do recommend.

Matthew H.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

August 23, 2023

Used on 11day trip on the Wonderland

I purchased this filter two years ago for big group and family trips. This year my wife and I took our two kids on an 11-day trip on the Wonderland Trail around Mt. Rainer. The filter performed great, even in dried-up silty/tea-stained lakes. At first, I thought this filter was overkill - many people use squeeze bottle-style filters. Though having to make water for the four of us over 11 days, I was happy I did. Most days, I was filtering around 20 liters of water per day. We filtered into a separate 10l bladder so anyone could quickly fill the cook pot, bottle, or brush teeth. When stowed, the filter, dirty water bag, and extra balder are chunky. However, the weight is negligible once you put this into the group gear pile that gets divvied up between the party. It was consistent with other group gear items in size and weight - rainfly, first-aid kit, stove and fuel, etc. Lastly, the flow rate is brought up on this filter. The filter works great if you hang it high and routinely flush the system. At the end of each season I've owned this, I "winterize" the filter by following the disinfecting directions supplied with the filter. This extra step makes a big difference in the overall performance of the filter.

Matt
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

2 out of 5 stars

August 11, 2023

Slow

Have now taken this filter on several back country trips and can attest that it works for filtering water, but beware it is slow as molasses. Even following all instructions in the owners manual and using tap water, the fastest flow rate I could get was 5 minutes per litre. This is 2 1/2 times slower than advertised and about 5 times slower than the regular MSR gravity filter. Would highly suggest not to get this filter unless you are in an area where it is absolutely necessary to have protection from waterborne viruses.

CT
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

July 19, 2023

Used for boundary waters trip with no problems.

I purchased this as an alternative to iodine treated water. Our 9 person crew used this exclusively for our drinking water for 10 days. Best paired with a dromedary instead of filling directly to nalgenes.

Kevin
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

4 out of 5 stars

May 17, 2023

Good Bacteria and Viral protection.

I use this filter at our my apartment for rusty water! Anyway, it does a great job. I filter about 3 gallons every two days. Four stars only for two reasons: First, I wished the filter removed major chemicals as well. I knew it didn't when purchased, but maybe further product development will offer this improvement. Second, it does filter more slowly than anticipated no matter how much I keep the filter flushed. Slower filteringactually improves water quality, but it would be nice to have some truth in advertising...

Ash
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

March 17, 2023

Guardian Gravity Purifier

Bought this purifier for a basecamp location with stream water in North Wales mountains. Quickly got an efficient system in place filtering 10 litres every day for next days use. This product, when used as demonstrated on the MSR website is a game changer for our camp, saving time and fuel boiling water for drinking and cooking. Used every day for 5 weeks so far. Just back in civilisation and Wifi for a few weeks so about to sterilise it.

Mark H.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

5 out of 5 stars

February 19, 2023

Grand Canyon in January.

25 days in the Grand Canyon. We settled the sediment, filtered through fiber and .5 paper filters then purified about 10-15 leters per day. Simple, predictable, easy and effective.

Brad M.
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site

1 out of 5 stars

October 30, 2022

Faulty product and no customer service

Familiarity:
I've used it once or twice and have initial impressions

First time using my filter and I find out there's a hole in the water bladder. Reach out for warranty with MSR and they state there's a 3 month delay in claims processing, its now been 4 months and I've heard nothing back.

Jon S
1 out of 5 stars

October 3, 2022

Super slow!!

- promised to be 2X faster than other bags, no, it’s 5X slower - its super heavy and not clean bag included - the filter unit never dries even though i leave it on my dish rack.

Jennie
a Cascade Designs brand site

Originally reviewed on a Cascade Designs brand site