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ok fair enough. if i add sludge remover for a week and then some new corrosion inhibitor will this prevent any sludge from enetering the radiators and the system again?

I am puzzled as to why my upstairs radiators have black water escaping (seems thicker than nomal water, but only a little) and my downstairs radiators are clear when vented! Is this normal?

Thanks John again - i feel so silly now asking that question! Lucikly my pump is fine and not pumping over and the system layout seems to be good as it has been fine for the 12 years I have lived at this house!

Thanks for your replies so quickly as well. One further question I have is why does pumping over draw air into the system?On top of this after opening the radiator air vents, the upstairs radiators have black liquid escaping but the downstairs ones are clean? How comes? It is strange?!

Sludge ... what exactly is it and how and why does it enter a central htg system? How do you def. know your system has it? Is sludge remover x400 any good? any good tips to remove it from your system and to keep it out?