Cold-weather water purifier cleans itself and more than doubles water volume

A water purifier is handy in all climes, providing troops a way to get clean water quickly when they run low or can’t carry enough for the mission. But in freezing conditions many such devices can lock up, break or stop working.

VIRGINIA BEACH, VIRGINIA – A water purifier is handy in all climes, providing troops a way to get clean water quickly when they run low or can’t carry enough for the mission. But in freezing conditions many such devices can lock up, break or stop working.

The MSR Guardian Purifier, featured at the annual Warrior Expo East, put on by ADS, Inc., overcomes some of those cold weather obstacles through a combination of materials and design, said Casacade Designs government sales director Tim Davis.

MSR Guardian Purifier is a higher-volume, self-cleaning water purifier being tested by the Army for cold weather survival kits. (MSR)
MSR Guardian Purifier is a higher-volume, self-cleaning water purifier being tested by the Army for cold weather survival kits. (MSR)


The purifier has two tubes, which allows 10 percent of the intake water to clean the filter as it fills. That removes the need to open up the device to remove and hand-clean the filter, which is a time-consuming task in subzero conditions.


The Gurdian also purifies 2.5 liters as it pumps, more than double the 1-liter capacity of many such filters currently in use.

And each filter can clean up to 10,000 liters before needing to be replaced, Davis said.

The device is currently under testing by the Army for consideration in their cold-weather survival kits, Davis said.