Quote:
Originally Posted by spedly
Wow...
So I did find an unused container of Pinpoint salinity calibration fluid. I used that to calibrate my refractometer and then checked the salinity of my display and fresh salt mix. Wow is it ever off. I'm measuring only about 1.021 salinity. That would explain why my calcium measurements are so off. Thanks for the tip Skimmer Juice.
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That's exactly what I was getting at when I asked how you were calibrating.
I'm glad you found the issue.
Also, if your RO/DI isn't perfect, using it for the Hanna Calcium Checker will throw those numbers off too. I recommend using distilled water in the Calcium Checker.