How to test the purity of water obtained through reverse osmosis?

Concerned with the deteriorating water quality at Tirupati where I live, I have been using ISI-certfied packaged drinking water purified by reverse osmosis and ozonisation. Before buying the water, I have been testing its quality by finding its TDS to be less than about 30 mg/l.

Although I am not testing the water for the multitude of other reference points for standard setting and drinking-water safety issued by the World Health Organization (WHO) in 2006 http://www.lenntech.com/WHO's-drinking-water-standards06.htm, I expect the water to be subjected to reverse osmosis to meet all those standards. 

Am I right?

Dr. R. Jagadiswara Rao
rjagadiswara@gmail.com

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