Conductivity to TDS comversion

Originally Posted by
aqazi81
ppm is the measuring unit for water hardness,[Parts per million (ppm)
Usually defined as one milligram of calcium carbonate (CaCO3) per litre of water].....
correct me if I am wrong.
Just to clarify for anyone that may be digging around through old posts looking for information...
PPM stands for parts per million and is a unit of measure for Total Dissolved Solids (TDS). This applies to many application, not just water hardness.
Micromhos or Microsiemens is a unit of measure for Conductivity.
The relationship between conductivity and TDS is non-linear and no single multiplier can be used to convert between the two. TDS is dependent on the type of mineral and does not only refer to calcium carbonate.
You can take a look at this article to see what I mean: Conductivity to TDS conversion
Different minerals have a different conductance value.
Again, just to clarify...
Hope that helps,
Jim Rutan
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