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Below the water line, wet return rust build up.
I just officially did the summer draining and flushing. All went well with that. I removed my great hallway radiator because I putting in a new floor in that room. Here is what I discovered. The radiator is one of my 2 pipe radiators. The return line where it is piped into a floor return header I felt was somewhat clogged with rust and debris. My conclusion was to add water to my empty boiler and see if this added water would come out this open pipe return header. No water came out. So probed the hole with my finger, black sludgie water came out. I found a long thin brush and stuck that in hole and cleaned what I could. This is a 3 year old system, cleaned and flushed from 4 different point on the system. The discovery was only made because I took out the radiator. My concern going forward is keeping this wet return header clean and flushed out. This is a major condensate return for boiler water. So i after my brushing of the hole, I added water very quickly and it seemed to flush out the dark brown residue and then it cleared out to fresh water.
Anyone have any suggestions on trying to keep the pipe rust down. Not a big fan of chemicals, but I am open to any kind of a safe additive that will help with keeping the rust sediment down.
Long cold winter here in Maine, I'm one guy who's glad to shut this thing off for a while.
Thanks for your time and advice.