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| Total dissolved solids (TDS) refer to the combined content of all inorganic and organic substances contained in a liquid, typically water, that are present in a molecular, ionized, or micro-granular form. TDS is usually measured in milligrams per liter (mg/L) or parts per million (ppm). (I’ll be using ppm in this article) | Total dissolved solids (TDS) refer to the combined content of all inorganic and organic substances contained in a liquid, typically water, that are present in a molecular, ionized, or micro-granular form. TDS is usually measured in milligrams per liter (mg/L) or parts per million (ppm). (I’ll be using ppm in this article) | ||