I have not maintained the pool correctly since we bought this house six years ago, so I don't have any historical readings. I finally got serious, did some research, and found this site.What were the readings when you first tested the water?
That's definitely easier to work with than scale. The link below might come in handy. If you can deal with the staining for a few more months, you might wait until Dec/Jan when our water temps fall below 60 to do the AA so that algae won't be such a concern when you drop the FC level down.I tested with ascorbic acid today, and it's definitely iron.