T. Scott
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Yesterday I replaced a very old non functioning water softener. To remove the old one I had to cut the 3/4" copper lines going in and out of the softener. When I cut the incoming line I noticed the inside of the pipe was coated in this very dark brown, almost black goo (photo looks more brown than black because of the flash). It's odorless and has a texture like watered down mud. The line on the outlet side of the softener did not have this build up on it. Is this just iron deposits? How can I get this out of my pipes? It bothers me to know that it's in there. I would assume this crud goes all the way back out of my house and to the main water connection on the street. I am on a residential water supply. My city gets it's water from ground source wells and is extremely hard (450-500ppm) or about 25grains of hardness.