Your Toilet Doesn't Push. It Siphons.

Press the handle and it looks obvious: a rush of water shoves everything down the drain. But that rush alone isn't what empties the bowl. We follow the water from the tank to the hidden bend behind the bowl, watch the trapway fill and start a siphon, find out what really moves the water, and explain why a flush ends with a gurgle — and why a bucket of water can do the same job. 0:00 The push myth 0:43 A tank full of falling water 1:38 The bend that blocks the sewer 2:32 Starting the siphon 3:21 What really moves the water 4:43 The gurgle and the refill 5:52 Less water, same job 7:03 Recap Simplified illustrations of a generic siphonic toilet, not to scale, no brands. Colours: blue = water, yellow = pressure. Narration uses AI-generated voices (ElevenLabs default voices "Liam" and "Matilda"). Sources: S1 U.S. EPA WaterSense, Residential Toilets (last updated 29/05/2026): https://www.epa.gov/watersense/reside... S2 U.S. EPA WaterSense, Specification for Tank-Type Toilets, Version 1.2 (2 June 2014): https://www.epa.gov/sites/production/... S3 U.S. EPA, WaterSense at Work, Section 3.1 Toilets (2023): https://www.epa.gov/system/files/docu... S4 U.S. DOE, Appliance and Equipment Standards, Water Closets (Flush Toilets): https://www1.eere.energy.gov/building... S5 10 CFR §430.2 Definitions (Cornell LII): https://www.law.cornell.edu/cfr/text/... S6 Richert, A. & Binder, P.-M. (2011). Siphons, Revisited. The Physics Teacher 49, 78–80.…: https://www.phys.uhh.hawaii.edu/docum... S7 University of Hong Kong, Department of Physics, How Things Work (PHYS1055), Chapter 2 "Toilet Science": https://www.physics.hku.hk/~phys1055/... S8 MIT course 2.972, student report How a Toilet Works (L. Knight; course page M. L. Culpepper, 1998–1999): https://web.mit.edu/course/2/2.972/Ol... S9 U.S. Patent 9,353,512 B2, High performance toilet with rim-jet control… (filed 2012, granted 2016),…: https://patents.google.com/patent/US9... S10 U.S. Patent 6,907,623 B2, Pressurized water closet flush system (filed 2002, granted 2005; listed by…: https://patents.google.com/patent/US6... S11 IAPMO Uniform Plumbing Code 2018, Chapter 10 Traps and Interceptors (copy published by the City of…: https://www.lynnwoodwa.gov/files/shar... S12 Virginia Department of Health, Frequently Asked Questions About Sewer Gas: https://vdh.virginia.gov/environmenta... S13 Seattle Public Utilities, How to Prepare for Planned Water Outages: https://seattle.gov/documents/Departm... S14 Commission Decision 2013/641/EU of 7 November 2013, EU Ecolabel criteria for flushing toilets and urinals…: https://eur-lex.europa.eu/legal-conte... S15 IUPAC Gold Book, "standard atmosphere": https://goldbook.iupac.org/S05906.html S16 U.S. EPA WaterSense, Fix a Leak Week (last updated 13/03/2026): https://www.epa.gov/watersense/fix-le... S17 European Commission, EU Ecolabel – Product groups and criteria: https://environment.ec.europa.eu/topi...