What is TDS?
Total Dissolved Solids (TDS) refers to the combined content of all inorganic and organic substances contained in a liquid in molecular, ionized, or micro-granular (colloidal sol) suspended form. Generally, TDS in water comprises inorganic salts (primarily calcium, magnesium, potassium, sodium, bicarbonates, chlorides, and sulphates) and small amounts of organic matter that are dissolved in water. TDS is a key indicator of water quality and is measured in parts per million (ppm) or milligrams per litre (mg/L). The level of TDS in water affects its taste, hardness, and suitability for various applications, including drinking, irrigation, and industrial processes. High TDS levels can indicate poor water quality and may require treatment to make the water suitable for consumption or specific uses.
Monitoring TDS in Water
Monitoring Total Dissolved Solids (TDS) in water is essential for assessing the quality and suitability of water for various uses, including drinking, agriculture, and industrial processes. TDS levels indicate the concentration of dissolved substances in water, encompassing a wide range of minerals, salts, metals, and organic compounds. High TDS levels can alter the taste of water, contribute to scaling in pipes and appliances, and affect the efficiency of water treatment processes. For drinking water, the World Health Organization suggests a maximum TDS level of 1000 mg/L for palatability, although levels up to 300 mg/L are generally considered excellent.
Industrial operations, particularly in sectors such as pharmaceuticals and electronics manufacturing, require water with very low TDS levels to ensure product quality and process efficiency. Consequently, monitoring TDS is a critical component of water quality management, enabling the identification of pollution sources, guiding treatment decisions, and ensuring compliance with health and safety standards. Modern TDS meters, such as Swan Analytical’s Solicon4, provide a convenient and effective means for continuous monitoring of water quality across diverse settings.
