So I need a chemist buff
or at least one who is just smart enough to be dangerous.
My pH has constantly been at 7.2-7.4 with a KH of 4, GH of 5, and TDS close to 190.
Anyway, today I did a water change and shortly after was running my every other week tests and realized my pH in my tank is now 9.0.
Quickly I tested pH meter on distilled water and it read at 6.9 (I just calibrated this meter this weekend).
Anyway, I ran the pH from tap water and am getting 9.9.
I checked TDS, KH, and GH in the tank and got TDS of 167, KH of 3, and GH of 5.
I'm assuming I'm ok but am curious what is missing that is being put into the h20. We have received a ton of rain in St. Louis so I am questioning if there is some groundwater leaching or something going on.
Just wanting some thoughts, or help to troubleshoot this situation.