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Dual flush toilet
A dual-flush toilet is a variation of the flush toilet that uses two buttons or handles to flush different levels of water. It was proposed by American industrial designer Victor Papanek in his 1976 book ''Design for the real world'', but the first practical implementation was designed by Australian inventor Bruce Thompson in 1980, while working for Caroma.〔(【引用サイトリンク】title=Dual Flush Technology )〕 Although the first generation dual-flush toilet caught on, a redesign in 1993 cut water usage in half when used properly.〔 The dual-flush toilet has since become almost universally adopted in Australia, New Zealand, Singapore, and Israel, with its use in new buildings often mandated by legislation in those countries.〔(Household and clothing: Dual flush toilet ), Powerhouse Museum. Accessed: 15 February 2015.〕 However, due to the more complex mechanism, it is more expensive than many other types of low-flush toilets.
== Mechanism ==
The traditional Australian flush toilet, the dual-flush toilet differs from siphon-flush toilets in that it relies on gravity to remove waste from the toilet. In addition to its dual flush feature, the lack of siphoning also results in it requiring less water to operate.〔 The lack of siphoning also means that it is similar to an aeroplane toilet; the water line is considerably lower than that of siphon-flush toilets. The main feature of the toilet is that it has two buttons for releasing water. It outputs water in both 0.8 US gallon (3 litre) and 1.6 US gallon (6 litre) capacities.〔(【引用サイトリンク】title=The Lowdown on Low-Flow Toilets )〕 The smaller level is designed for liquid waste, and the larger is designed for solid waste. It also uses a larger trapway in the bowl, allowing for water to come out faster and clear the bowl efficiently.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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