Total dissolved solids (often abbreviated TDS) is an expression for the combined content of all
inorganic and
organic substances contained in a liquid which are present in a molecular, ionized or micro-granular (
colloidal sol) suspended form. Generally the operational definition is that the solids must be small enough to survive filtration through a sieve size of two micrometres. Total dissolved solids are normally only discussed for freshwater systems, since salinity comprises some of the ions constituting the definition of TDS. The principal application of TDS is in the study of
water quality for
streams,
rivers and
lakes, although TDS is generally considered not as a primary pollutant (e.g. it is not deemed to be associated with health effects), but it is rather used as an indication of aesthetic characteristics of
drinking water and as an aggregate indicator of presence of a broad array of chemical contaminants.
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All material that passes the standard glass river filter; now called total filtrable residue. Term is used to reflect salinity.
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