How are TDS and Conductivity related?
The relationship between TDS and conductivity is a function of the type and nature of the dissolved cations and anions in the water. TDS can be measured in the field using a conductivity meter. This measures the conductivity of the water, i.e., the ability of the water to conduct an electrical charge, and not the actual total dissolved solids. The TDS value is then calculated by the meter based on an assumption of the relationship between conductivity and TDS.
