I agree with you, Sawyer has not figured out a way to determine if their filters can be damaged or "harmed" by a hard freeze. I was quoting their international web site, their filters are very popular overseas. (From a legal view I doubt a most lawyers would attempt to prove "no harm", similar for a scientist, so I'm not sure "how" to interpret this statement of theirs. To prove a negative is a difficult hurdle, to say "have not found any evidence of harm so far", might be more convincing.)
http://sawyer.com/international/faqs/
this forum did not let me post url link because I am a newbie to forum
Food coloring is worthless for testing most quality filters, I should not have mentioned it, sorry. There are better methods to test but they require a serious biological lab.
Best to start a completely new thread on hot water bottles and/or bags for putting by your femoral artery or where ever and drink in the morning. There are dozens of issues, pros and cons, problems and solutions with taking anything wet into you bedding especially in very cold weather. My rule of thumb is to read the specs on any gear and test it out. I.e. can a water bottle/bag survive being frozen solid if lid is off or lose, can it hold boiling water or just very hot? How well does the lid seal? Same thing with filter: is only the center cartridge freeze resistant or if a tube or pump mechanism is full of water will it survive a hard freeze, how careful must I be to drain it? But very cool that MSR filter cartridge is proven to be hard freeze proof, not all filter companies can claim this. A new thread on this topic would be a good idea, IMO.
Tons more to discuss about tinders, how to package them, make them. I have never used those "Weber Lighter Cubes" has anyone vacuum sealed individual cubes or half cubes of these and used them to start a wilderness camp fire? How do they compare to PJ+cotton balls? I would probably pre-shave off some fine material then seal it all up individually so they are all ready to go in an emergency. Speed is critical if you are going into Hypothermic shock.
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