We had our radiators flushed out two years ago after a blockage. Immediately after there was a "tinny" sounding rattle, like a small piece of metal or something, which moved through the system a room at a time (sometimes you could hear it in two adjacent radiators too). It went away for a while but came back after I bled one of the radiators!
Any tips on how to get rid of this. It is pretty irritating. I would have thought there was something like a piece of mesh that could be used to filter it out. I don't know how to do that though, as I have never tried to shut off or disconnect a radiator before.
Many thanks for any advice.