Add SinkTwice to the below toilet update and expect to use between .7 and 1.6 gallons per bathroom visit including washing hands (at a maximum).

Assuming about one gallon is normally used to wash hands with the below conventional toilets, this amounts to at least a 65%-93% savings over the below toilets just by using the water twice with a newer toilet.

However, Sink Twice not only uses the water twice but properly configured with water diversion, it can make even Water Sense labeled toilets an estimated 37% more efficient, meaning water savings may wind up actually being more like 77%-95% compared to the below toilets with conventional hand washing.

low flow toilet saves water