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Where I live, there are a few chalk lakes/ponds nearby, in old disused chalk quarries.
How would I got about making the water from these drinkable? Is it simply a water filter, or would I need tablets and/or boiling? I live in a very industrial area, with lots of factories. Would there be a possibility of chemical, metals etc. in the water that I'd need to be wary of?
Any thoughts would be greatly appreciated!