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Washdown Toilets

A toilet that uses the washdown method usually has a large trapway, typically around 4 inches, compared to the 2- to 3-inch traps of most siphonic toilets. Because the trap is so big, water cannot be siphoned; instead, water pushes the waste down through the trap.

Siphonic Toilets

Siphonic toilets use water to create a vacuum effect that pulls down waste. The siphonic method of flushing is the most common and best system.