Randy Holmes-Farley
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Yes, pH directly impacts ORP in an inverse way as you note. It does not necessarily mean there is any other chemistry change causing that.I'm mostly using kalkwasser with a small amount of soda ash solution.
pH has a high of about 8.2 with lows as low as 8.06.
I have never really looked at orp. I do notice something interesting, daily orp are lows are corresponding to daily pH highs. Meaning when pH is at its highest orp is at its lowest.