| Definition The quantity of dissolved materials in a sample of water. Description Total dissolved solids in water, expressed in mg/l. It is determined by chemical analyses and is a measure of the salinity of water. Electrical conductivity measurements can also be used to estimate TDS. Why is TDS important? The suitability of water for a particular use is dictated by the salinity of the water. 
 
 
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 TDS drinking water guidelines 
 
 
 
 
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