My two issues seem to be low KH and a lot agitation with air pump the well water raises the PH temporarily. Is this CO2 outgassing?
My tap has a metering pump injecting soda ash to safeguard the pipes and appliances, no water softener (I am not using it bypassed).
PH = 6.8 – 7
KH = 9
GH = 6
TDS = 300
Bypassing the soda ash.
PH: 5.5
KH = 0
GH: 6
TDS = 190
If I run a pump and air stone for 24 Hrs. without the soda ash adjusting system that I use for the whole house the PH shoots up from 5.5 to 7.8 at a KH of 0. But if I run just the circulating pump no air it doesn't go up as much. That 7.8 will start dropping creating a very unstable PH. So for now I been adding some backing soda when I fill so my PH has been high with an end point of 7.8ish PH and KH = 1 - 2. (Temporary solution)
I been running a few different tests.
50/50 mix, 2.5 gallons from my tap (soda ash system) with 2.5 gallons of RO. This morning it was PH = 8, KH = 5 and GH = 3.
I also filled one 55 gallon drum (actual gallons 57) with 22.8 gallons (40%) from my soda ash system and 34.2 gallons (60%) RO and had the pump circulating only. The PH started at 6.75 KH of 4 (when full) and this morning the PH was at 6.86 TDS = 140. I turned on the air feed to the pump head and I will check when I get home this afternoon how much does it go up.