What is TDS?

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What is TDS?

Answer: Total Dissolved Solids (TDS) is a measure of the combined content of all the inorganic and organic substances such as mobile charged ions, minerals, salts or dissolved metals in a volume of liquid. Normally TDS is used in water testing, where TDS is defined as anything present that is not pure water (H2O) molecule or suspended solids.


Finding out the exact amount of TDS in water has many applications, one of the most common being for drinking water – high TDS can result in an undesirable taste and could indicate the presence of toxic minerals. The United States Environmental Protection Agency’s recommended maximum level of TDS in water is 500mg/L (500ppm). High TDS indicates hard water which can cause scale build-ups in pipes and valves causing problems down the line for business and home owners. The list of uses expands to maintaining the right levels of minerals for aquatic life in aquariums to gaining the perfect TDS levels to brew a cup of coffee.

TDS meters are based on the electrical conductivity (EC) of the water sample with pure water having virtually zero conductivity, and an increasing amount of TDS increasing the EC. A tool used for water testing is the MyronL Ultrameter 6PIIfc which will measure the conductivity, pH and redox of a given sample. Results can be gained by simply dipping the meter straight into the sample which means no probes can get lost or damaged – perfect for application in the field. Click here to get the MyronL Ultrameter 6Pllfc Bundle.

For more information on the options for TDS analysis available from Camlab in the UK or the rest of the world please contact us below.

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