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From our good friend John Pemerton, Lochinvar's National Service Manager comes this explanation:
"The black discoloration sounds like the magnetite layer from the carbon pipe is breaking down. All carbon steel boiler pipe will have a layer of iron oxide form as water passes through. With a minimum of oxygen the layer will turn black, domestic water turns brownish red or orange, this is why boiler water is almost always black when drained. If new water is introduced or the system flushed, the magnetite layer can break loose this is most likely what you are seeing."
"The black discoloration sounds like the magnetite layer from the carbon pipe is breaking down. All carbon steel boiler pipe will have a layer of iron oxide form as water passes through. With a minimum of oxygen the layer will turn black, domestic water turns brownish red or orange, this is why boiler water is almost always black when drained. If new water is introduced or the system flushed, the magnetite layer can break loose this is most likely what you are seeing."
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