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Thanks john you have been really helpful and i appreciate it. You seem like a plumber to me !!!!! I thought it was weird when i drained my system for approx. 5 minutes and it was clear - maybe the sludge is stuck and needs to be loosened? As the water wasn't black and thick like i...

Thanks for your help. I'll buy some this weekend and try it. One thing though-after draining some water from my system it already looked clean. How comes ? Is my system already clean or is the sludge like stuck somewhere and needs to be removed with the chemicals?

if your boiler stat is set to maximum it doesnt matter: as long as your room thermostat and cylinder thermostat are set at the desired temperatues then they will cut out before the max boiler stat temperatue cut out at about 90 degrees C.

Hi my system is open vented It had a fernox inhibitor put in years ago the water when drained was clear the f & e tank has a bit of muddish stuff at the bottom but nothing major no pumping over and no leaking i vent my rads now and again but not much air, mainly just water...

Is there any way to see if my central heating system needs a clean/flush? If i drain a few buckets of water from the draining point on the ground floor and it is black/brown and thickish will this tell me i need to? i think i may do as some radiators take longer to heat up than they did say...