An average RO purifier wastes approximately 3 litres of water for every 1 litre of purified water. According to this estimate, only 25% of the total water is purified whereas 75% of water comes out as waste, which usually makes its way to the sewage drains.
Read More at:
https://www.weforum.org/projects/20l-saving-20-lakh-litres-water
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