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Boiler Water Dark after Radiator Replaced
I replaced a cracked radiator two heating seasons ago with a used one. The one I got had been in a neglected hot water system and it was full of rusty silt. I banged around on it with a rubber mallet, dumped it out repeatedly, and blew it out with compressed air quite a bit before installing it. It seemed that I had most of the loose stuff out before I put it in.
Since then my boiler water has become more dark brown and rusty than it was before, even though I flush the boiler every fall and blow it down a little every week during the heating season. I'm guessing that the radiator is still shedding rust. The boiler seems to run fine, and I haven't seen excessive sediment in it when I've flushed it out . . . just coffee-like water at the bottom.
Is there cause for concern? Will this eventually end on its own or should I be shopping for a better radiator? . . . or am I missing something important? (The feed water is fairly benign, Lake Michigan sourced and fairly soft.)