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The deposits are gritty not rubbery, however thanks for the suggestion as I'll get the washers replaced so we can eliminate them as the cause. I don't have a water softener installed but we are in a very hard water area here.

Hi there, I have a Worcester 24CDi which was installed approx 6 yrs ago. I've noticed over the last few months that when I run the hot taps black bits are coming out with the water. These black bits look to me (the untrained eye) to be carbon deposits. Has anyone else seen this? If so, is this a...