In fact they ahve been told if they try boiling the water, which we are usually told is ok to do, that in this case it will only serve to concentrate the toxins even more.
@Stealth83: Boiling water kills the organisms. Which is usually the issue with non potable water. If however those organisms create a toxin, that may not boil out (break down) with that heat. So you boil off some of the water leaving the toxins more concentrated (assuming they don't boil off).
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