I used to believe that. If I couldn't boil, I would drop in an iodine tab. Or not, if I was feeling lazy.

Sucking down water with agchem run off in it changed my opinion (and helped me loose ten pounds in two days sick). Carbon filters are your friend.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.