I use well water and have had these stains off and on for years. I use about 4lb of citric acid to remove them and the water sparkles and pool is beautiful when finished. Chlorine use is high for a few days after treatment and I aireate w/ jets, water fall and slide to bring ph up. I've tried several sequesterants, Regal Metal Out, Aquachem Metal and Scale, etc. and I don't see where they help. I use a TF100 and have to use the copper method to test ch. I wanted to have it tested for metal today but since it's stained now, the metals may not show on a test. I don't get any rain water and I use bleach.
My well water is:
Even if I test + for metals which is probably a given, what's a treatment that may work?