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Does water in the sun get purified from or polluted by algae, fungi and bacteria?

We drink water from PET bottles laying around on the soil (27° latitude, about 200 metres above sea level). They are filled with fresh water from a well and reused over and over again. We drink the ...
1
vote
1answer
41 views

Potability measure of water on Volcanic Mountains

Is it safe to drink water found from natural resources on the Volcanic Mountains? Considering Chemistry part of it, What could go wrong if I have no way to boil it, at the most I can filter it with ...