FirstSpear TV

OR – MSR Guardian Purifier

There is a lot of cool stuff coming out of Cascade Designs but this beats them all, hands down. The Guardian is not only a self cleaning water filter by using 10% of the filtered d water to comstant,y flush itself. It also meets NSF Protocol P248, used by the U.S. Military which means it will filter out viruses, bacteria and protozoa.  


It uses a dual-acting pump head, capable of producing 2.5 liters per minute of potable water with minimal user effort. It is very easy to pump.  



Ultrafiltration (UF) Membrane Technology
-0.02 micron pore size provides a true physical barrier for removing all suspended solids and microbiological contaminants (viruses, bacteria, and protozoa).
-High flow rates achieved at low pumping pressures.


Pump Design
-Dual-acting pump mechanism minimizes user effort but maximizes water production.
-Self-positioning pressure relief valve protects against over-pressurization of the UF filter cartridge.
-Ergonomic handle design has sufficient finger clearance for the purifier to be operated while wearing gloves.

Flow Rate 2,500 mL/min
Weight 16 oz.
Pump Rate 80 strokes per minute
Dimensions 2.8 x 4.6 x 8.2 inches
Microbiological Efficacy
Viruses > 4 log reduction†
Bacteria > 6 log reduction†
Protozoa > 3 log reduction†
Filter Capacity > 10,000 L in clear water
> 600 L per NSF P248 standard
Operational Life 40 days based on a 15 L/day daily water consumption
Filter Shelf Life 5 years


10 Responses to “OR – MSR Guardian Purifier”

  1. RJ27 says:


  2. Archangel says:

    If the filter has 10K L capacity, why is operational life only 600L / 40 days of 15L per day? Does the filtration start to degrade below a certain standard after 600L?

    • Greg says:

      the 10k L capacity is in clear water, the 600L capacity is in whatever “NSF P248 Standard” classifies as near water enough to purify for drinking but isn’t doing your gear any favors.

  3. Dan says:

    Not on their site yet. Oh well maybe soon.

    • Mitch says:

      I read on another site it’s supposed to be available early 2016

      • Fluffy says:

        From another site, expected to hit shelves Jan 2016.

        MSRP @$400 USD

        • Seamus says:

          WOW! a bit pricey. I can get 4 MSR Sweetwater Filters for the same money!

          • SSD says:

            Even though they are both made by the same company, this does things the Sweetwater doesn’t. Go research the specs on both.

  4. I have so many water filters but I now need this one

  5. Kango says:

    Pretty neat with the self cleaning. I have a Sawyer 2L gravity fed and the mini filter.