Step 3 of 4 · How a Toilet Actually Works
Siphon action and water seal
Siphon action and water seal — step 3 of 4 in How a Toilet Actually Works. Bowl + trapway are shaped so a big rush starts a siphon that pulls contents over the bend into the drain.
Free home & diy tip: Siphon action and water seal (step 3 of 4 from "How a Toilet Actually Works").
Bowl + trapway are shaped so a big rush starts a siphon that pulls contents over the bend into the drain. Then siphon breaks — leftover water is the seal against sewer gas.
Weak flush often = partial clog, low tank level, or mineral-clogged rim holes.
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