My water chemistry:
FC = 5
TA = 80
CH = 230
Borates = 20
CYA = 65
When I use the Pool Calculator I get the result that to change the pH from 8.0 to 7.6 I need to add 57 oz of MA.
To change the pH from 7.4 to 7.0 I need to add 78 oz of MA.
In the first case a decrease of the pH of .4 requires 57 oz of MA and in the second case a decrease of the pH of .4 requires 78 oz of MA.
I would have expected that the amount of MA required would have been the same; perhaps it has been too many years since I took chemistry. Can you explain why more MA is required to lower the pH when the starting pH is lower?
If you watch the pH levels for eye comfort and the CSI index this result implies that you can reduce the amount of MA used by maintaining your pool at a higher pH level.