Randy Holmes-Farley
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That’s the question.
I think I was overdosing sodium carbonate (alk got to 10.3). Maybe a lot of the calcium was precipitating out?
Magnesium was running high at 1550-1600 as well. But my understanding is that that would compete for binding sites between calcium and carbonate, not lower calcium… ?
I clearly need to test calcium more frequently. Thought I had the ratio somewhat dialed but it’s likely way off.
Yes, that could do it. Any dosing of alkalinity not accompanied by calcium has a tendency to lower calcium.