| Jason, are you using one the recommended brands of calibration standards?
That does make sense about the low ionic strength of pure water. Essentially it means that there are no ions (atoms or molecules that have a positive or negative charge because they have gained or lost an electron), which would be impurities, in the water. That is after all what we are aiming for! Let me know if you want a chemistry lesson and I will be happy to go into more detail.
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