what system have you got?? Vented / sealed?
How many rads on system ??
Do you want a proper job done on them, or is it a 'quickie flush' you're after?
For a proper job, you may have to remove existing rads, if there are any, and flush them through manually, or you could add chemical treatment to your system to cleanse it. Depends, there are a few methods, and it's about how much time you wish to spend doing it.
Powerflushing is the better mehtod IF it's done properly.
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