A low flush or low flow toilet is a flush toilet that uses significantly less water than a full flush toilet. Most low flush toilets use 6 liters, or 1.6 gallons per flush as opposed to the usual 13 liters, or about 3.6 gallons. They came into use in the United States in the 1990s, citing water conservation concerns.[1] Many dual flush toilets have a 6 litre and a lower flush.

In the USA in 1992 President George Bush Sr. passed the Energy Policy Act. This law made it mandatory that a toilet could not consume more than 1.6 gallons per flush. This law went into effect Jan 1, 1994. At first many people were very skeptical about the low flow toilets claiming they had to flush the toilets twice to achieve their desired task. Joe Knollenberg a Congressman from Michigan tried to repeal the law but was unsuccessful. The performance of low flow toilets has significantly improved since 1994. Research has shown that low flow toilets can save a family of 4 more than 22,000 gallons of water yearly.[2]

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