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When you analyze the construction of a toilet, you will see that it is nothing more than a fancy syphon. As such, the water from the flush is used to start the syphon functioning, and then to add enough additional water to scour the inside of the bowl and replace the water that is “sucked out” of it. Each type of bowl uses its own method of starting the syphon, from the “brute force” of a washdown toilet that just overwhelmed the syphon with a large amount of water, to the pressure assist Flushmates that create a venturi effect to start the action.
