Drox
TK Veteran
When you washed it out, how many times did you rinse it through with the hosepipe?
Sludge has a consistency of thick paint
Did you fill rad when flushing it and lift it side to side and up and down a few times to make sure you got everything out.
Yesterday I just drained the rad and then flushed it outside with a hose pipe, I ran the hose pipe through it for about 5 or so minutes, whilst banging the radiator with a soft low hammer.
Does the rad heat the full way if you isolate all other rads to force water to that one radiator? If so could be a balancing issue or circulating pump not strong enough no more.
I haven't tried balancing yet, I might give that a go next. But this issue has been fairly recent, it worked fine the past 15 or so years.
Adding it to one radiator won't do anything, the hot water is traveling around the whole system every time the heating comes on.
So what I mean is, if I add the cleaner to one radiator will it run through the whole system? Or would I need to drop it into the cold water tank in the loft for it to run through?