Post pictures using this button: and links to the image at Photobucket, Flickr, Picasa, etc.

Or email them to poolforum@gmail.com . . . but I'm behind on those and it will be mid-week or later before I get them posted.

I'll have to see if the MSDS sheets reveal what's in "Jacks #1", but without that information, telling me that it removed the stain may help Jack, but it does nothing for us. Instead try using Vitamin C tablets on one area, and little pile of Iron Out on another. Vitamin C is ascorbic acid, and Iron Out is sodium hydrosulfite + sodium metabisulfite.