the solution is directing the rainwater from extended large sloping roofs through a filter into a covered cement tank periodically treated with bleaching powder or keeping a copper net size 3x6 ft in the tank to kill pathogens.

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the solution is directing the rainwater from extended large sloping roofs through a filter into a covered cement tank periodically treated with bleaching powder or keeping a copper net size 3x6 ft in the tank to kill pathogens.