Correct way is with a special pump that costs about £1000. Can be done roughly with sludge buster from plumbers merchant. Drop level of system, put in header tank, fill up and run for approx week drain down fully and re-fill, you could also remove rads one at a time and flush through with mains water but this is lengthy
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by plumbers1 » Fri Jul 20, 2007 10:25 pm 