Is all that gunk in both the hot and cold lines? If only the hot, and the cold is fine then it might be something connected with the water heater. I'm not a plumber or water heater expert but you might have a plumber take a look from that angle.
You might also hook up a long water hose to the water faucet and then let it run for a good five minutes or so. Shame to waste all that water but maybe the line needs to be flushed???? I would be worried also that the line into the dish washer and the refrigerator ice maker could get clogged up.
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