My spa has developed some spots, there is a texture to the spots, they are a greyish/green. Water chemistry is right, no algae growing anywhere. Nothing to my knowledge has been dropped into the pool, the pox does not seem to be spreading, it is however in a few different areas in the Spa.
I am thinking of sanding the surface to see if I can remove from the plaster.
I am thinking of sanding the surface to see if I can remove from the plaster.