Remember! Fish, mosquitoes, algae, etc. can not – and do not – live in poisonous water. Given the choice between two still ponds in the wild, one with mosquitoes, or algae growing in it – and another nearby it, which may be seemingly clear – experienced survivors would prefer to drink the water that has the organic life growing in it. The other standing water, even though it appears clear – is obviously unusable or undesirable to other living organisms and therefore it may be poisonous.
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By Alexander Turcan