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When you boil dirty water, how clean would it be? Is it drinkable?

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    Clean and lack of live bacteria are different things. – James Jenkins Nov 20 '15 at 1:03
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    This question already has some good information about boiling water. So while not a duplicate of this exact question (what percentage), this may have the information you're looking for. – Chris Mendez Nov 20 '15 at 1:07
  • My understanding (from reading a lot on backpacking, survival, etc) is that boiling for 90 seconds will kill everything (viruses, bacteria, protozoa, etc) but will not decontaminate any sort of chemical contamination that might be there. – Michael Martinez Nov 20 '15 at 23:39
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How many percentage does the bacteria in the water die if it is boiled?

100%. More info here: How long does water need to be boiled for to kill all bacteria / viruses?

How clean is it after boiling? Is it drinkable?

It will still have any dirt, etc., but that isn't necessarily bad for you. Boiling will not get rid of chemical contaminants such as selenium or toxins that can be produced by algae. If the water is really nasty and murky, then if only for the sake of taste and aesthetics, you may want to filter it through a bandana or a shirt first.

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