I agree with David and his ...

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I agree with David and his views on considering microbial contamination.  In our rural areas in Tamilnadu, India, our rural and indigenous communities use Phyllanthus emblica (Indian Goosberry) to purify water in wells. 

Branches of Phyllanthus emblica (dumped in wells for purification of water and for removing salinity in water). Woods of Phyllanthus emblica are capable of reducing the hardness of water and the amount of magnesium and sulphate in drinking water. Our ancestors used the woods of this tree in all drinking water wells, ponds and tanks in villages invariably.