Hi all 8)
Just opened our pool tonight to find we only have 2.5 feet of water in it and the entire pool (on the walls) has a coppery colored dark stain around the entire perimeter of the pool. I took a brush to it for a minute and it looks like it's not going to come off with a fight. Never had this problem before. Used the BBB method all last season. Any idea on how to easily get it off?