Iron stains are showing up on several areas on the coping (see pics). The PB did not warn us that this would happen. This coping stone was one of the choices made available by the PB. On one area, the stain is even dripping down into the plaster area of the pool. I would hate to be swimming in a pool with ugly rust stains coming down the side from the coping that is leaching iron. The pool is under construction with decking and plaster still not installed. Because the PB took on too many jobs, this pool build has been going on for almost a year. What recourse do I have?