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Old 06-24-2010
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First, as svHyLyte has pointed out, you should NEVER connect a head to the potable water system without a really good and positive vacuum break and disconnect between the two. The most common way to set up the head to pump freshwater is to plumb the head intake line in to the head sink drain line. This is really simple if the head sink drains via a through hull that is below the waterline. To flush with sea water, just plug the sink and it will draw water up through the seacock. To flush with freshwater, close the seacock and fill the sink.

I'd point out that if you're actively using the boat and head, flushing with seawater is fine, since the water doesn't stay in the lines long enough for the plankton and such to die off. However, if you're going to be away from the boat for a while, flushing the head intake line and such with fresh water makes sense. This allows you to conserve the fresh water for when you need to use it. BTW, don't use the shower to flush the head, since that will leave the intake side still full of salt water and lead to that side stinking...
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Telstar 28
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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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