You must consider how you ...

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You must consider how you will sterilise the water, and for the sterilization to be effective you will need to increase the pH, unless it is a UV system you are using, even so at a pH of 4-5 skin irritation, possible  irritation of the throat and eyes may also occur, you may consider filtration through a calcite media to increase the pH, but if this water is collected from a roof our surface it should be sterilised.