Cheri is exactly right. A recirculating toilet does NOT draw fresh water from the plumbing system on every flush. When you first arrive at your campsite, you "charge" it by putting a couple gallons of fresh water in the black water tank, along with a small bottle of blue deodorant liquid (there are several kinds, actually, including powder and tablets). The toilet flushes by pumping some of the deodorized blue liquid back through the bowl. From then on, nothing more goes into the black water tank but waste. With this arrangement, as Cheri says, you don't use up your precious supply of fresh water.
The black water tank is built into the toilet, rather than being a separate tank as in a 5th wheel. But just like the 5th wheel tank, when it is full, you dump it through a slinky hose and an outside valve. Exactly the same.
Bill
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