I am very interested in the Hyperflow, and was wondering when somebody was going to post about it. The one quesiton I have that was mentioned by another poster is that I have read this thing is not good below freezing, and the the filter element can break if frozen. So is it basically a "warm weather" filter, or can it be used in the cold (i.e. can it be left sitting aroung in temperatures below freezing without the filter element being damaged)?