I purchased this house a few years ago, and I kept the previous owner's pool guy. He says that it used to be medium-dark gray, but the previous owner had it acid washed to lighten it up. It is now a varigated light gray.
My pool guy dumped in some copper last summer and it left some dark gray stains on the bottom where it sat. I just drained my pool, and my pool guy poured a watered down muriatic acid on the spots, and on a couple of rust stains. In all instances, I now have deep dark gray stains. Almost black.
Does anybody know what I can do to get rid of them?
Thanks in advance,