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Conductivity To TDS Conversion Factors
1. Factor - the conductivity to ppm TDS conversion factor. Multiply conductivity by this factor to get ppm TDS for the type of TDS reading needed.
2. 442 - a formulation that most closely represents the conductivity to ppm relationship, on average, for naturally occurring fresh water.
Factor = Actual TDS / Actual Conductivity @ 25 oC.
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