From: Flush with Options.

The company claims its Sydney Smart dual-flush, WaterSense-certified toilet saves more than 18,000 gallons of water per household per year compared to 3.5-gpf single-flush toilets, and more than 5,000 gallons over 1.6-gpf, single-flush toilets. Users may choose a 0.8- or 1.28-gallon flush, which averages out to 0.89 gallons per flush. The toilet features wash-down flushing and a trapway nearly twice as large as the industry average. 800.605.4218.