Rotate the valves on your water pump and stick the end of the hose in a jug of antifreeze and turn your pump on. make sure all faucets are closed. It will suck antifreeze into the system until it's pressurized. Open all hot and cold faucets, flush toilet some, run hot cold on outside shower, run some antifreeze through black tank flusher, then shut off pump to relieve pressure and push in the city water check valve for a few seconds. I dump some more antifreeze down each drain to be sure p-traps are full and there is plenty of antifreeze against dump valves. Antifreeze is cheap, apply it liberally.
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