I am on my second AA treatment. Stains came back after first time, I'm guessing because I did a 50% water change to lower CYA, (community well water) I also let the ph get to 7.5. I am curious though about the relationship with high FC and metal staining. I have read many times here that high ph combined with hi fc precipitates metal staining. My question is this; with a higher cya of about 70 (thus needing a higher fc level) am I fighting a losing battle with keeping the metal suspended? Like a said, I am on my second AA treatment now. Brought FC to zero, added 2 lbs of AA (38k pool), stains lifted perfectly. Then added 5 quarts jacks pink stuff. Let it circulate for 24 hours. Readings are;
FC = 0
TA = 70
PH = 7.0
I know that I need to bring up FC slowly, like 2ppm at a time I think so thats what I am planning. I am wondering if the higher Ph (7.5) on the first AA treatment is what brought the stains back. So now I am thinking about leaving the ph at 7.0 for now and slowly bringing FC up. Any thoughts?