More detailed question: Why is it that the water stays clean inside the pipes when the main water to the house is turned on, even if we don’t use the water for a while, but gets dirty if we turn off the main water valve and turn it back on later?
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This is also why you shouldn’t cook (food/coffee/etc) with hot water from the tap. Hot water has been sitting in a hot water heater and can transfer its sediment.
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