To understanding how a toilet siphon works, think about a train going over a mountain.

As American Standard Chinaware Director James Walsh explains in this video, once a train crests the mountaintop, it heads downhill, pulling the rest of the train with it.

In a toilet, the flushing action pushes water and waste up the s-shaped trapway, until it crests at the top, the part known as the weir.  The water then rushes downhill, creating a pull that scours waste and paper from the side of the bowl and out the trapway.

Tags: toilet, toilet flush, toilet siphon
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