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It depends on the filter. Many filters use microtubules. If there is water in the filter and the snow freezes that water then you may crack the microtubules. You'll likely have no indication that you just broke your filter, potentially leading to the consumption of contaminated water.


Yes. There's nothing wrong with melting snow and then purifying it with a standard water filter. Most of the water in mountain streams was snow at some point anyways. That being said, this is generally going to be a very inefficient way to make water, and if the temperature is below (or really anywhere near) freezing, you're going to be thirsty. I would ...

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