I'm using the old Poolmath calculator online and although the numbers look pretty good (except for the salt), I'm having difficulty dumping enough MA into the water to get pH below 8. And I'm confused by the difference in the recommendation next to the pH row and the Effects of Adding section at the bottom of the page. Here's my current numbers:
FC: 4
CC: 0
pH: 8.0
TA: 70
CH: 300
CYA: 70
SALT:4000
The pH line has 8.0 current and 7.6 target and it recommends 18oz of 31% MA.
But the Effects calculator predicts 18oz would drop pH by 0.18 (and would take 40oz to drop it by 0.4).
It appears that the Effects calculator is more correct since I'm putting in about a quart per day to keep the pH from skyrocketing over 8. Why is the pH row calculation so inaccurate? And can I expect to keep dumping all this acid in forever?
FC: 4
CC: 0
pH: 8.0
TA: 70
CH: 300
CYA: 70
SALT:4000
The pH line has 8.0 current and 7.6 target and it recommends 18oz of 31% MA.
But the Effects calculator predicts 18oz would drop pH by 0.18 (and would take 40oz to drop it by 0.4).
It appears that the Effects calculator is more correct since I'm putting in about a quart per day to keep the pH from skyrocketing over 8. Why is the pH row calculation so inaccurate? And can I expect to keep dumping all this acid in forever?