Professor Toilet » low-flow toilets http://www.professortoilet.com Just another WordPress weblog Thu, 02 Sep 2010 17:14:54 +0000 http://wordpress.org/?v=2.8 en hourly 1 Why do toilets flush on 1.6 gallons of gallons of water? http://www.professortoilet.com/2009/06/30/why-do-toilets-flush-on-1-6-gallons-of-gallons-of-water/ http://www.professortoilet.com/2009/06/30/why-do-toilets-flush-on-1-6-gallons-of-gallons-of-water/#comments Tue, 30 Jun 2009 14:15:12 +0000 Professor Toilet http://www.professortoilet.com/?p=189 Seems oddly precise to have the law limit the amount of water used in toilet flushing to 1.6 gallons.  Where did 1.6 come from?  What not a nice round number such as 1.5 gallons?

The odd number comes from the origins of low-flow toilets.   1.6 gallons equals 6 liters, the amount of water commonly used in toilets across Europe and Asia at the time the US Energy Policy Act of 1992 was in development.

Source:  SafePlumbing.org by the Plumbing Manufacturers Institute.

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