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Cobb / Webb - 1989
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My Tank Thread
I'd run a cross check with a Salifert ph kit.I'm not a calcium reactor guy, and I know they work at pH's down in the 6.5 range since they use carbonic acid to do the dissolving. I just can't figure out how it could drop the entire sump that low if it wasn't running.
Calibration could be an issue, but that would have to be WAY off since pH is a log scale.