I recently replaced all of the plumbing inside my walls and put in a new bathtub, faucets, etc. I used all copper pipes and used compression fittings and sweating for put everything together.
I first put in a black galv. nipple to attach the new faucet to. I changed that to a silver galv. steel nipple and then replaced that with an all copper nipple. Each nipple as created dirty water (little black coal or charcol looking "dust") when the faucet has not been used for a few days.
Our water is very high in iron content but we soften it prior to its use. This did not with the old tub and pipes, only since everything was changed.
What is causing this "dust" or "soot" in the water? I thought it might be the combination or the galv. and cooper, but it keeps happening now that everything is copper.
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