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Black oily/graphite? in hot water from baxi combi boiler?

I am getting some oily/graphite like globules in my hot water from baxi combi boiler. Anyone have any suggestions as to what this might be
mike, December 2007
3 years i think

mike, December 2007
How old is the system?

Josh, December 2007
link Click here to see other fixes for Baxi.