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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]
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 equivalent average use per person is 52.1 gpcd (gallons per capita per day) or 197 liters per capita per day. Because the distribution of indoor use in the sample of homes is positively skewed, a more appropriate measure of central tendency is the median, which is about 125 gphd (or 472 lphd). Toilet flushing is the largest indoor use of ...
US federal law has mandated no more than one gallon per flush since 1994, and the EPA estimates that the average urinal is flushed 20 times per day, which gives an average water use of 7,300 US gallons (28,000 L) per year. Mechanical traps are not allowed by US building codes [citation needed] but are allowed in many other countries.
A fixture unit is equal to 1 cubic foot (0.028 m) of water drained in a inches (32 mm) diameter pipe over one minute. [2] One cubic foot of water is roughly 7.48 US gallons (28.3 L; 6.23 imp gal ). A Fixture Unit is used in plumbing design for both water supply and waste water. Different fixtures have different flow requirements.
A dual flush toilet; note the two buttons at the top of the cistern. A dual flush toilet is a variation of the flush toilet that uses two buttons or a handle mechanism to flush different amounts of water. The purpose of this mechanism is to reduce the volume of water used to flush different types of waste. The design takes advantage of the fact ...
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. Modern washdown and symphonic variant standard flush toilets in the United States use 1.6 gpf or 6 lpf (liters per flush).
A dry toilet (or non-flush toilet, no flush toilet or toilet without a flush) is a toilet which, unlike a flush toilet, does not use flush water. Dry toilets do not use water to move excreta along or block odors. They do not produce sewage, and are not connected to a sewer system or septic tank. Instead, excreta falls through a drop hole.
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