Rwise, I suspect not bacterial but mineral. We’ve very high mineral content in the water. With loads of red iron we run a softener and carbon filters. We Use a zero water filter for drinking water. For growing, I’m using untreated well water with minerals and all, pH at @7.2 - 7.3. I’ve been trying a combination of lemon juice, white vinegar, 1/2 T pet gal. Molasses. It seems like it takes a lot to get down to 6.8 or so. But it usually creeps back up to 7 after @ 5min.
Ive been realizing that perhaps I need a better fluid pH tester like puglover said.
thank y’all for the info.