Probably the best way to know which one is to see if there's a patina on the inside of the pipe or not.
There is, on the leaky sections that have been replaced, at least.
Of course, that necessitates removing the piping. But I think Tony's at the point where he has to replace the piping anyway. But if he decides to go with copper, he should definitely check that out, and possibly ground the piping better if he needs to.
With copper prices at an all-time high, I think PEX may be the way to go, concerns about resale value be damned.
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