Interesting problem. I have repaired leaking copper water lines(repeatedly) that have a deep (pipe wall deep)visible etching running randomly thru the interior of the pipe caused by electrolysis (electric decomposition). I learned from Mike's Grounding & Bonding home study class that this is caused by stray electrical current flow & can by alleviated by additional or alternate grounding means. This stray current may not be coming from your electrical system, but a neighbor or utility power transformer. Right Mike? Gary Lehrman
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