As per IS 10500 (Drinking Water Standards), the desirable limit for Total Dissolved Solids (TDS) is:

Why is this the answer?

IS 10500: TDS desirable limit = 500 mg/L, permissible (in absence of alternate) = 2000 mg/L. High TDS causes scale, corrosion, salty taste, and laxative effect. TDS measured by evaporation of filtered sample at 180°C. Reverse osmosis effectively removes TDS.

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