I had this problem in a restaurant that I managing many years ago. The pipe
probably wasn't more than 15 years old. The plumber who did the replacement
pipe asked if I was using the pipe as a ground and seemed to think that that
could cause the problem. I wonder if you have a separate ground cable for
the house or if they used the water line?
The insides of my hot water L copper pipes are coated with a sort of crusty
deposit...too thick to be easily removed. This sort of deposit would
probably interfere with adhesion of an intended coating. My piping is 14
years old. No leaks here.
. We found a company that claims it
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