Hello guys and gals - I have a question that has got me stumped.
At the beginning of this week, Monday the 4th, I began lowering my TA in preparation for the warmer weather to hit AZ very soon. Based on the pool calculator, I am aiming for 90-100ppm to keep my CSI at a decent level.
On Monday my TA was 130; I added 4 cups of acid per the calculator to starting bring pH from 7.8 to about 7.0-7.2. All was well the following day.
TA went from 130 to 120, pH to 7.2.
By Thursday pH only went up to 7.4-7.5 and TA held at 120. Then the rain hit - it added about 1.5-2" into my pool. pH shot up to 7.8 and TA went up to 130 again. By Sat most of the rain was gone, lite drizzle, so I added another 4 cups acid based on the calculator to bring the pH down again.
I check this morning, and my pH is at 7.2, right where it should be, but my TA shot up to 150...not sure how. I redid the test 2 more times...same 150 reading.
Overall results today are as follows.
I'm at a lose here - does rain cause a rise in TA? Would acid rain have something to do with that?
The night before my readings were as follows.
Any thoughts? I'm stumped at how 2 days of rain could bring my TA back up from 120 to 150. It seems i'm going to have to start the lowering processes over again.