Ive just noticed there is a big difference in amounts from the high side to the low side of the pH scale.
For instance a 16100 gallon pool, TA 100, Borates 0, I have the following doses to lower pH with dry acid:
ph 8.0 down to 7.8 = 9.9 oz weight
ph 7.8 down to 7.6 = 13 oz weight
ph 7.6 down to 7.4 = 18 oz weight
ph 7.4 down to 7.2 = 26 oz weight
I usually adjust from 7.6 to 7.4 with 1.5 cups of dry acid which is actually correct on the calculator. I have no idea about the rest. Why does the calculator have different doses at different ranges? This doesnt seem right to me but I have no idea. The pH calculations to raise pH is the same way. I havent used pH in years so I dont even know if any of it matches with what I would use. I know the effects of using chemicals section at the bottom of the page is static and I figured there would be differences in TA and Borates but not from different pH's.