I am having black particles from all of my cold taps which stain and smudge when i try to remove them. From what I can see and have read it appears to be rubber suggesting something is degrading. A welsh water engineer visited and was very helpful but we couldn't locate the cause, the following day he took a sample from the mains which was clear, thinking it was an issue on my end. I have also had a plumber look at this and he is also unsure of what the problem could be as I have no flexi hoses and this problem only effects the cold taps being unlikely all the washers are failing , he thinks it is probably in the hot water but is most likely at the bottom of storage tank as sediment so I don't see it coming from the hot taps.
something did come to me today, I am metered could it possibly be the O ring inside the meter itself causing this problem ? Or some other rubber parts that could degrade ? I am at a complete loss, the water company says its an internal problem and the plumber who visited thinks it is coming from beyond my property.
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