I've been on this forum constantly since last September, and I'm very comfortable with the basics practiced by everyone here (in theory, at least). Now, it's time for me to open my pool and get my hands dirty.
First test at 7:30 am:
Added enough dry acid (using up the last of the pool store purchases) and MA to get the pH to 7.2, as part of my future plan to lower TA. Re-tested pH an hour later and it was right at 7.2. Water is hazy, but can see the bottom. Maybe a green tint, but only barely. I know I got junk in it last year while closing it, so I want to shock to start fresh. Based on a CYA of 65, shock level is 19. I decided to target 24 so that I would never go below 19 during the process. According to the pool calculator, I need to add 4.5 gal of 12.5% bleach to get to 24. Poured it in slowly, and started scrubbing/vacuuming.
2 hours later, tested to see where I was at...
I tested again at 11am FC 36.5 CC 0, and just now at 12:30pm FC 33 CC 0. Even though the numbers are high, they seems to be behaving correctly.
I re-measured my pool, and it might be 32' dia instead of 33', but that still can't account for that big of an error, can it? Along with the fact that a successful drain/refill for high CYA 2 weeks ago, and my pH test above indicates my size is correct.
This last time I did the test I went slowly and made sure the drop hung from the tip before falling. Can anyone think of anything I did wrong? Can the bleach be that "new"? Thanks.