TDS stands for total dissolved solids, and represents the total concentration of dissolved substances in water.
TDS is made up of inorganic salts, as well as a small amount of organic matter.
Common inorganic salts that can be found in water include calcium, magnesium, potassium and sodium, which are all cations, and carbonates, nitrates, bicarbonates, chlorides and sulfates, which are all anions.
Cations are positively charged ions and anions are negatively charged ions.
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