jamfitz

Hi... Purchased a home with an old pool in horrible shape. Last year I had the old surface sand-blasted/replastered with a smooth white plaster finish. I just opened the pool, and the walls and the shallow area pool bottom have a blotchy greenish stain on them. I've tried brushing it off but that's not working. What type of stain might it be and how to I deal with it? Thanks! JF