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A low-flush toilet (or low-flow toilet or high-efficiency toilet) is a flush toilet that uses significantly less water than traditional high-flow toilets. Before the early 1990s in the United States, standard flush toilets typically required at least 3.5 gallons (13.2 litres) per flush and they used float valves that often leaked, increasing their total water use.
This system is suitable for locations plumbed with 12.7 or 9.5 mm (1 ⁄ 2 or 3 ⁄ 8 inch) water pipes which cannot supply water quickly enough to flush the toilet; the tank is needed to supply a large volume of water in a short time. The tank typically collects between 6 and 17 L (1.6 and 4.5 US gallons) of water over a period of time.
The toilet has two buttons on the cistern rather than the single-flush one; one button delivers a lesser amount of water (eg. 3 litres) and the other a greater amount (eg. 6 litres). [7] It also uses a larger 10 cm trapway in the bowl, allowing for water to come out faster and clear the bowl efficiently.
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