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The amount of water used by conventional flush toilets usually makes up a significant portion of personal daily water usage.

However, modern low flush toilet designs allow the use of much less water per flush.

Flush toilets are usually connected to a sewer system in urban areas and to septic tanks in less built-up areas.

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is a piece of hardware used for the collection or disposal of human urine and feces.

In other words: "Toilets are sanitation facilities at the user interface that allow the safe and convenient urination and defecation".

Globally, nearly one billion people even have no access to a toilet at all, and are forced to do open defecation (particularly in India).

Diseases transmitted via the fecal-oral route or via water, such as cholera and diarrhea can be spread by open defecation.

Some modern toilets pressurize the water in the tank, which initiates flushing action with less water usage. This type of toilet is common in many Asian countries.

The toilet can be connected to one or two pits, in which case it is called a "pour flush pit latrine" or a "twin pit pour flush pit latrine". Flush toilets, when used on ships, are typically flushed with seawater.

The water in the bowl acts as a barrier to sewer gas entering the building.

Sewer gas escapes through a vent pipe attached to the sewer line.

They can also be spread by unsafe toilets which cause pollution of surface water or groundwater.

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