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1. TDS level of 100-300 is good for drinking purposes

Dear Arvind Singh,

The Indian Standard set by the Bureau of Indian Standards which is one we should use as a reference states something totally different. The standards very clearly states that potable water should ideally have TDS upto 500 and also says in the absence of this quality, water having upto 2000 TDS can be consumed.

Indukanth Ragade

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