New answers tagged backpacking
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If you still have your PolarPur bottle you can purchase crystal iodine off of ebay. Look for this seller, "ibmsuccess2010", he sells and ships from Lithuania. I place a quarter teaspoon of the iodine back into the PolarPur bottle and it will work like new. The seller packages and ships very discreetly. The amount if crystal iodine you will get will probably ...
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Leaving aside the questions of water purity, then the answer would be fresh water, no question.
Salt water does not lather up many soaps very well, although detergents are a different story. Salt water also does not rinse cleanly, so even those long-distance sailors that use salt and Joy detergent (no corporate affiliation, but lots of online reading) use ...
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You should never plan to not purify. Levels of contamination will depend on the location. A stream running by a pasture 50 miles upstream will possibly contain more contaminants than ocean, even if the ocean (on average) is worse.
If you have a way to purify, then purify! If you can't purify, consider heating your dishes over a flame afterwards until ...
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Seawater typically has more organisms growing in it than a flowing stream of clear water. However, it's a good idea to use something (boiling, wet ones, clorox wipes, etc.) that kills giardia, microspiridia, and other protozoa or bacteria than can give you the diarrhea.
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This is almost certainly close to the R-value for a "dead air" space the same thickness as the leaf layer and the less compressed the leaves are the higher the R-value.
Setting up a test for this using a heat source and one or more thermometers shouldn't be too difficult.
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