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Thanks... it is not well water (regular city water). I can tell you that rubbing with sand paper will not remove it (the "eraser) that I am using is essentially sandpaper embedded in rubber... The Stain Eraser for Concrete Pools, Beige - Doheny's Pool Supplies Fast It is some kind of staining...

The areas do not feel rough and/or raised. Just stained. I can post all the stats if you would like, however, they are all within the range within the Taylor test-kit (K2006) book. (except for right now on account of the high FC 30PPM (which I am currently letting slide downward toward maint...

LOL. No, it is normally at ~ 3PPM. It was only being maintained at 30ppm to see if this staining could be dealt with. My OP explains that. :) I have used Yellow-Gone in the past with success, but not in a very long time. I did try it again to deal with this issue, to no avail. This issue...