Sean's #1 point is important and not widely recognized. In addition to the hoses, salt water organisms grow inside the toilet bowl itself--the channels that deliver water when you pump. This is evidenced by black mold around the bowl top. And smell. (Forum reports say lake water is just as bad for organisms as salt)
The easy way to convert to fresh-water head is to plumb the sink drain to the toilet water intake, using a valve and short hose. The sink water then flushes the bowl. The only drawback is that for normal discharge of the head sink (brushing your teeth), the valve must be reset to overboard. Or I suppose, come to think of it, the toothbrush water could serve two, uh, different purposes.
But guests already have a hard enough time grasping the plumbing.
...
Valve at left is set for direct overboard of sink water.
The easy way to convert to fresh-water head is to plumb the sink drain to the toilet water intake, using a valve and short hose. The sink water then flushes the bowl. The only drawback is that for normal discharge of the head sink (brushing your teeth), the valve must be reset to overboard. Or I suppose, come to think of it, the toothbrush water could serve two, uh, different purposes.
But guests already have a hard enough time grasping the plumbing.
...Valve at left is set for direct overboard of sink water.
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