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Thanks for that very useful Web-Page Breezer! However are you sure I can do this on a closed vented sealed system that has water in it that is under approximately 1 bar pressure? :?:
Sorry for the delays but...
Hi - I wondered if I could ask for some assistance...
I have a closed vented(?) Central Heating system (i.e. boiler has a water pressure light) which only heats the radiators (our hot water is on anothe non-connected system)...
It seems I have sludge in some of the radiators (black water...