Most people don’t give a second thought to what happens when a toilet flushes, but it’s a good idea to know exactly how your toilet works so you know what to do when something goes wrong with it.
When you push down on the handle to flush your toilet, it pulls a chain that opens the flush valve inside the tank. This causes the water in the tank to drain quickly into the toilet bowl, which creates a siphoning effect on the wastewater already in the bowl. This is what causes the water in the bowl to go down your drain. The wastewater goes into the local sewer system where it either goes into a septic tank or a water treatment facility.
Once your toilet’s tank has drained and the flush valve closes, the refill valve in your toilet will refill the tank and the from your home’s water supply lines. A float ball in the tank will close the refill valve once it rises to a certain level.