You really don’t want copper in your water it can cause stains etc.Regarding the copper I have no idea ? Is Dial not supposed to be in there
While a 7.2 ph is acceptable, lower ph than that for extended periods of time is not & can cause erosion in your heater putting copper into the water. Chronically Low ph can also break down seals & orings in your equipment -and regarding my pH I have no idea what my normal ranges are is that considered low in these issues cause oil in the water can copper across the oil in the water?
I do it is a black greasy gunk in the skimmer at the water line