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Great thanks for the advice, still learning.....

Do you just unscrew the screw in the middle of pump and do back up when water comes out?

Thanks for your help, one more question though.....to flush a system is it a matter of draining system (after applying chemicals) or do you have to force water around the system using a flushing machine..... Thanks

Hi Do you have to bleed pump in a combi boiler?

Hi Guys I would like to flush my central heating system as it is old and full of sludge, how would i go about this...it is a sealed system Thanks guys