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New Steam Radiator Sediment
I just received a large order of new cast iron steam radiators, and while carrying one of the smaller ones I noticed that when I turned it upside down I could hear what sounded like a bunch of tiny sand/pebble pieces falling to the bottom. I tried this with the others and sure enough, same thing.
I popped off one of the plastic protective caps and shook the radiator, and what came out where what looked like tiny metal shavings from the same material as the radiator.
Is this normal/commonly found? I don't think I'll be able to completely shake all of them out, especially from the larger radiators due to their weight. Should I be concerned about these causing noise and clogging/jamming the air vents?