The way I have the head plumbed on my boat is:
Head flushes directly to holding tank. Holding tank pumpout line has a diverter valve. One side goes up to the deck pumpout fitting, the other goes down to a diaphragm pump and to the seacock and through-hull that was previously attached to the head.
Any place you'd pump the head directly overboard, you can dump the holding tank instead. Less plumbing=less places to leak or stink.
The reason I generally recommend the diverter valve is that if someone accidentally leaves the seacock open and you go to the pumpout dock, you can pull seawater back through the macerator pump or diaphragm pump, damaging it in the process.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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