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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,213
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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I think any filter will be damaged from freezing. A friend of mine left his MSR filter with water in it out when the temperature went below freezing. No more filter. On several occasions I have brought my filter into the tent during the night to make sure it did not freeze.