What does TDS measurement mean in practice?
The portable meter converts conductivity to estimated TDS using a factor that may vary between devices.
When does it matter?
The reading shows the RO performance trend well, but does not identify ions and is not a substitute for water safety analysis.
Which solutions are related to it?
Water is measured at the same temperature before and after the membrane, the electrode is rinsed and the result is interpreted together with conductivity and retention.