I have an old house. Most of the water supply pipes have been converted to copper (not all) The upstairs bathtub is getting small pieces of what looks like tp or newspaper. I had assumed it was slough from the galvanized pipe and replaced the supply from the basement to the upstairs. (all but the exposed stainless from the floor to the faucet--claw-foot tub) The tenants are again having the problem after a couple of weeks. Any ideas as to what I could be dealing with? The tub was refinished about 5 years ago. Could anything there be peeling off? I really don't want to call in the plumber again!