I decided to run a full set of tests this morning because it hasn't been tested in a while, and I don't know this pool's tendencies.
The thing that really confuses me is the TA.
7/2 pH 6.8, TA 20, added 15 oz baking soda -> pH 7.0
7/4 pH 6.8, TA 40
7/5 added 50 oz Borax, 32 oz baking soda
7/21 TA 110
HOW did TA jump like that? I ran the test twice to confirm. My fill water is TA 30. Evaporation is minimal, well-balanced by rain.
I've double, triple checked the Effects of Adding, pool dimensions, ingredients and quantities of chems added. It just doesn't make sense.