Because of other stuff going on, I let my 28,000 gallon pool go farther than I thought this winter. Water was a very dark green, although not much leaves and debris in it, I've been vacuuming, and most, if not all, the leaves are removed. Still green for a long time even though adding a lot of chlorine.
Finally SLAMed it last night with 10 bottles of 8.25% bleach.
Finally found where my test kit was hiding and lowered ph to 7.4.
FC is currently 11, with CC at 0.
Tested and retested CYA (with new test chemicals) and result is a bit lower than 20, perhaps 15. Where did it go? I haven't tested it for a couple of years, as it's been about 90.
Anyway, pool water is looking much better, it's a very light green now. I actually did a search and found some postings from about five years ago, that said that the CYA may have created ammonia with all the dark green algae (and maybe bacteria) I had.
Any thoughts besides adding CYA? Suggestions for level to shoot for?
Thanks in advance for your thoughts.