High efficiency toilet (HET) go beyond the standard and use less than 1. 3 gallons per flush (a 20% savings over conventional 1. 6 gpf toilets). The WaterSense label will be used on HETs that are certified by independent laboratory testing to meet rigorous criteria for both performance and efficiency. Only HETs that complete the third-party certification process can earn the WaterSense label. A dual flush toilet has two buttons for flushing, a half flush and full flush. The half flush, for liquid, uses 0. 8 gallons per flush. The full flush, for solids, uses 1. 28-1. 6 gallons per flush depending on the model. Using the 1. 6/0. 8 dual flush technology can reduce water usage by 40% compared with traditional toilets that use 2. 9 gallons in a single flush and by more 76% if using a 3. 5gpf toilet. ; Biscuit ; 622320-609177-BI