For all those that have Iron problems I thought I'd share my first time AA treatment for Iron stains. This was my first year with a pool in a new house. Many things conspired keeping me from moving in as soon as I'd like to. As a result I had difficulty getting the pool in balance. It didn't help that it seems like it had been closed for 2+ years. When I opened it there were bushels of oak leaves and considerable staining in a bathtub ring where the water line was. I assumed that these were tannin stains, and some were, but the brown ring continued. In addition as I SLAM'd the pool and dealt with high PH a couple of times the stains got worse particularly just under the tile line (FG Pool). Vitamin C confirmed metal (iron) stains.
I was reluctant to treat it given my difficulties getting in balance the first few times. No that I am preparing to close I gave it a try. I let FC drift down to .5 maybe less (hard to tell) CC tested 0.5, Adjusted PH to 7.0, TA 100, CA 260, CYA 60, Salt 2000.
Added 2lb of bulk AA purchased from Amazon by getting in the pool and pouring the powder right at the edge of the waterline concentrating on problem areas. The stains magically vanished. I let the pool run 6 hours like this then added double the recommended dose of Hasa Super Stain out (which had previously slightly reduced the stains). I added Polyquat 60 after another 24 hours, and let the pool run in this condition for another 24 hours. before restoring CL levels to my normal 5-6ish. The whole time the water temp has been 68-72degF helping slow algae issues.
I am also running a CuLator in the pump basket. I'm not sure if it will help, but it was a gift. When I close the pool in a couple of weeks I hope to pump much of the Iron out for good!
In the end this was not that difficult and the biggest issue was that the water got quite cloudy for the first 8 hours but cleared up after that.
I hope this helps those that have been thinking about this treatment for Iron stains. I have been helped greatly by this forum and like to return the favor when I can!
Thanks to All and Good luck!