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Total Dissolved Solids, also known as TDS, are inorganic compounds that are found in water such as salts, heavy metals, and some traces of organic compounds that are dissolved in water.High TDS level alters the taste of water and makes it salty, bitter, or metallic. High TDS levels also indicate the presence of toxic minerals which is hazardous for health.The TDS level in water can be determined with the help of a TDS meter. Results are displayed in parts per million (ppm) — a reading of 1 ppm means that the water contains 1 milligram of dissolved solids per kilogram of water. According to the EPA, the maximum concentration of TDS for drinking water is 500 ppm.