I came to this website a month ago after growing algae for the first time. I think I successfully shocked my pool with info on here at that time despite a CYA level of 85 or 90. Yes, I had to use A LOT of bleach but it solved my problem so it was worth it to me. I stopped using my tri-chlor tablets at that time to keep CYA from raising even more and switched to liquid bleach.
My pool has looked crystal clear all summer (even despite the algae) but now my pool is cloudy and here are my readings:
CYA - 0 (how is this even possible?)
FC - .4
CC - 3.4
TA - 180
CH - 230
I put a box of borax in a little while ago in hopes to raise the pH a bit. I also filled up my feeder with tri-chlor pucks again since I need both stabilizer and chlorine. What should I do now?
How is it possible that CYA can drop that much? I had just checked it last week and it was still at 85.
Thanks so much for any advise!