Quote:
Originally Posted by spedly
Thanks Jordon. I should have been more clear. Up until two weeks ago I had only used RO/DI water for calibration. But I am using American Marine Pinpoint calibration fluid now. I'm measuring 1.025 salinity now (up from 1.021) but am still measuring lower than expected calcium levels.
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Oh gotcha!
Have you tested both freshly mixed salt water and your tank? I'm at a loss why the Calcium would be so low. Have you tried a different test kit?
I have the Hanna Calcium checker, and always get results all over the place. I think unless the Distilled water is "lab grade" its contaminants can mess up the results.