Re: [at-l] Keeping filters from freezing

[Tim Hewitt <thewitt@fairchildsemi.com>]

"W F Thorneloe, MD" wrote:
> 
> The alcohol would pass through, but a little bit would remain as the filter
> lost vacuum. You could swig the last "snowball" cocktail before pumping the
> next water.
> 
> So long as the water being filtered is liquid, it shouldn't freeze while in the
> filter. I would take the filter out after filtering, shake it out, _maybe_ add
> some EtOH, but not worry a great deal about it. If the water temp is that cold,
> you have more pressing worries than giardia. Even iodine would be slow and less
> effective.
[clip]

At those temps iodine is totally ineffective, not less effective. How about 4
hours of contact time at 34 degrees!

-Paddler
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