The dual flush toilet designed in the 1980s in Australia uses two separate buttons for each type of human waste. One button, for urine, uses less water to flush than the other, for feces. This way one needs much less water to flush waste. It reduces water usage by 68% from the traditional low-flow toilet design because it only uses 0.8 or 1.6 gallons per flush. The traditional toilet uses 2.9 gallons in a flush. The dual flush toilet is able to use less water because there is a trapway design at the bottom of the bowl which is wide enough that less water is needed to wash the waste down and no siphoning action is needed. The wash down approach pushes the waste down instead of pulling it down.
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