How Toilets Work

The toilet. The commode. The john. The loo. The porcelain throne. No matter what you call it, it is inevitable that we come to discuss this device, because every home has at least one. But more important, we'll discuss the toilet because it is a technological marvel -- a fascinating water-handling system!
Parts of a Toilet
There are several interrelated components that make a toilet do what it does, as shown here:
Note: The water level as it relates to the siphon action is simplified in this animation. In reality, the water level does not remain constant as the water flows down the tube.

If you take off the tank cover and peer inside, you will see all of these parts. They might look slightly different in your particular toilet, but they are all there in one form or another. The three main systems that work together are:
The bowl siphon
The flush mechanism
The refill mechanism