don't have numbers right now (will tomorrow), but I have noticed 3 locations of blue spots in my new gunite/white plaster pool. When going underwater to see the spots, they look like individual blue crystals, as if they were quartzite, but it shouldn't be as I did not have quartzite installed. any thoughts? I ahve tried the spot acid and trichlor treatments with no change. I have also tried one of those stain removers for the pole and waterproof sandpaper....no changes.