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If you have an apex you can use the solution I run.
I use two expansion power modules from my Genesis Reef Systems Storm Unit.
The apex will allow the RODI to be top off supply if PH is greater then 8.4
If less then 8.4 it uses the Kalk stirrer as top off.
Both are fed from separate pumps.
PH stays constant around 8.3-8.4
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