Getting the run around. Had 3000 ft of silver travertine laid around a new pool. The pavers laid on the concrete slab, under the roofline, are becoming horribly discolored 5 months after being laid in random spots. Pool builder is no where to be found. Cleaners tested it and said it’s non organic. Don’t have any idea how to remedy it as it is ruining a very expensive project. Anyone have any thoughts? Could it be an install problem or drainage?