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Hi, my CYA severely drops when I do ascorbic acid treatments for staining in my fiberglass pool. I always have to add CYA after. I do not understand the chemistry of it but, it has happened every time after the treatment. Perhaps someone has some reasoning to add. Wondering if anyone else has...

Thank you for the advise. I'll be working on the chemistry and studying up on the ascorbic acid treatment for stains, as well -vitamin C tabs lifted the test area stains. :( Rebecca

So, I found this forum while researching algae and staining problems a few weeks ago. I have learned much! Add me to the "pool-stored" list! (I hate going there, anyway) Bought tf-100 last week and tested yesterday. FC 5 CC 0 TC 5 pH 7.3 TA 60 CH 180 CH of tap for refill 120 CYA 0-10? I have...