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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 ...


In additions to other answers, I build my own stakes for about $10 each and happily leave them behind when rappelling off routes if no other options exist. Leaving your ice Axe, pack, hammer etc behind is not only iffy in terms of survival, its expensive.


I have used them heaps for Rappelling, and am more comfortable using a Snow bollard than any other single anchor. I have seen snow stakes bend under the load of one person, ice screws pull the ice off the rock. I have seen deadmen fail when the knots came undone (might have been incorrectly clipped 'biner) (students on that course got a valuable knot tying ...

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