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Cleaning a dirty main return
My boiler water keeps getting dirty and I've been skimming it every few weeks. After skimming it looks good but after a couple weeks starts to get dirty again. After several long skims I decided to dig a little further. I took off the antler on one of my mains and put a scope down it and was pretty surprised at the level of gunk. I had some pipe leveling issues that got fixed a few months ago and am worried I might have part of a main slowly rusting out.
Anyway, I took these pictures. I ended up running some water through where the mains are and down through the wet return to a valve right before the Hartford loop. It was gunky at first but ended up clean. Are there other ways to clean the mains? Is that something I should do?
(Sorry for the orientation. The river of mud is really on the bottom)