Stir...you must have it?
Long story short, I ran across something about treatment plants adding CO2 to reduce pH, then found an article that Calgary was considering it in 2000. I have to get a FW pH, I tested with the SW kit, it was 7.7, but that is hardly the 8.2 cichlid water we boasted four years ago.
I had read about tapwater CO2'd and RO/DI's. It wasn't a good thing.