Please let me know the simple inexpensive modification to the head sink and intake plumbing that would allow me to rinse all the seawater out of the system with freshwater.
Just tee the head sink drain line into the head intake line. Close the seacock, fill the sink with fresh water, flush the toilet. Keep the sink plugged except when in use...otherwise during "normal" use, the toilet will pull air from the sink, preventing the pump from priming.
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