It doesn't really confuse them, since I don't let them futz with the valves. I just tell them to flush the head after washing their hands... and that flushing the head will drain the sink.
The head won't fill up since, the head pump won't let water just flow through it. However, if they are extremely stupid... they can get the head sink to overflow.
As for contamination... one thing you seem to forget is that most marine heads use a dual-action piston type pump. The exception for this is the Lavac head, which uses a diagphragm bilge type pump. The bacteria may cross from the flush side to the intake side of the pump past the inner pump seal. No swimming needed. Then the bacterium can get into the water tank via the water in the intake line, if it is plumbed into the fresh water system directly.
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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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Still—DON'T READ THAT POST AGAIN.