Sand in water
I'm not a plumber, but I do not think it is possible to get 'sand' only on the hot side, unless this residue is coming from within the system and on the hot side pipes. If the cold is clear, then my logic says that it is coming into the house clear, and probably the problem is in the hot water heater or hot water lines. Can you flush the hot water heater tank by running cold water in and letting it drain out the drain valve, hopefully removing any residue. I guess a filter on the "out" pipe of the heater would be an answer. Good Luck.
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