How Toilets Work
From Toiletpedia
It may not be rocket science, but a good toilet flush is a lesson in physics.
It starts with the toilet before the flush, where the water in the bowl and in the trapway blocks sewer gases.
When the toilet is flushed, the tank releases water into the bowl through the flush valve—the opening between the tank and the bowl. Some water is diverted into the rim of the bowl which is released through small holes to cleanse the sides of the bowl.
As the water height rises in the bowl, gravity pulls it down, which pushes the water into the up-leg of the trapway. That is why this mode of flushing is called “gravity fed.”
When the water rises high enough in the trapway, the water spills over what is called the “weir.” When the water spills over the weir, it pulls water and waste with it.
The trapway action is called siphon action—literally, siphoning water and waste out of the bowl and out of the building.
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