Left my sawyer in my pack in the back of my buddys pickup for 4 hours at 19°. Think it’s toast??
Left my sawyer in my pack in the back of my buddys pickup for 4 hours at 19°. Think it’s toast??
Hmm... that's a difficult one. Where was it before it ended up in the truck? Was it in a warmer environment or was it already cold? If it was inside your pack then I am guessing it was fairly well insulated, unless it was in an outside pocket. If it was insulated from the cold then maybe it would be ok.
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I finished my AT hike on Dec 3 of this year. By the 20th of December (after just sitting around in my apartment for a few weeks), my Katadyn filter was already shot and would barely pass water. The same thing actually happened to my Big Berkee filter (at home) while I was away on the hike. I came home to find that $250 worth of filters on my home system were useless as well. I guess its just an annoying filter thing that once you put water through it, you have to keep it wet or it turns into a paperweight. *sigh*
It takes approximately 3-hours for a cup of water to freeze in 18-degree temperatures. When secured in a pack the insulation value of the gear surrounding it would likely add another 30-minutes to an hour, perhaps more if its inside clothing.
That said, I typically use the "if there's a doubt, there is no doubt" philosophy and would agree with HooKooDooKu. Given the low cost of the Sawyer filters if one has a doubt the device is working properly, get a replacement to eliminate the risk.