Total Dissolved Solids (TDS) is commonly used for assessing the concentration of impurities in water in areas such as environmental monitoring and boiler and cooling tower water monitoring. There are 2 main methods for testing TDS:

Contents of the Guide

1. Take an accurately measured volume of the sample, filter it to remove suspended solids and then evaporate off the water at 180°C for 1 hour. The evaporating dish is weighed before and after the test and the increase in weight is the TDS.
2. Using an electronic TDS meter. Strictly speaking, these meters do not measure TDS; instead they measure the sample’s conductivity and use a correlation to report a TDS value in ppm (ppm is the same as mg/l).


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