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1. TDS of drinking water - Preferable range 100-500 mg/litre

In drinking water, TDS should be preferably in the range of 100mg/liter (100 ppm, parts per million) to maximum of 500mg/liter (500 ppm, parts per million). Water having TDS above 500 ppm will taste salty.

Studies done by the WHO showed that water consumed by rats, dogs and cats with TDS below 100 ppm had bad effects on the animal's stomach.

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