Dear Vishnu Ravi Ram K, You ...

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Dear Vishnu Ravi Ram K,
You should be guided by the standards, sanitary rules and regulations of India, as well as the Guidelines on the quality of drinking water of the World Health Organization (WHO).
But they can allow, in the main, to produce drinking water that is clear of various contaminations.
Distilled water is the same pure, but she is of little useful and in large quantities can even be harmful to human health.
If you are interested in the possibility of producing not only clean, but also useful (biologically active) drinking water, then we can cooperate.
Best wishes,
Chemist-ecologist Vitalius Gediminas.