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Based on the WaterSense averaging rule over two reduced flushes and one full flush, a dual-flush toilet with a full flush at the US legal maximum of 1.6 US gallons (6.1 L) must have a reduced flush of 1.12 US gallons (4.2 L) or less to meet the WaterSense standard of 1.28 US gallons (4.8 L) on average. [17]
Low-flush toilet (3212351477) Low-flush toilets use significantly less water per flush than older conventional toilets. In the United States, Older conventional toilet models, typically those built before 1982, can use 5 to 7 gallons of water per flush. Toilets from the era of 1982-1993 may use a somewhat smaller 3.5 gpf.
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.
The amount of water used by conventional flush toilets is usually a significant portion of personal daily water usage: for example, five 10 L (2.6 US gallons) flushes per day use 50 L (13 US gallons). Modern low-flush toilet designs allow the use of much less water per flush, 4.5 to 6 L (1.2 to 1.6 US gallons) per flush. [citation needed]
Using the efficiency standards established by EPACT92 as a baseline, the EPA instituted the following flow-rate guidelines for WaterSense: toilets must be manufactured with a maximum flush volume of 1.28 gpf; showerheads must have a maximum flow-rate of 2.0 gpm at 80 psi; and bathroom faucets must be manufactured with a low-flow volume rate of ...
Currently, the average flushing volume for all sampled toilets is 2.6 gallons per flush (gpf) (or 9.8 liters per flush (lpf)). Future reduction in toilet end use will occur as more homes use low-flush toilets (1.6 gpf, or 6 lpf) mandated by the 1992 Energy Policy Act, or high efficiency toilets (1.28 gpf or 4.85 lpf) which meet the EPA ...