A pig toilet (sometimes called a "pig sty latrine") is a simple type of dry toilet consisting of an outhouse mounted over a pigsty, with a chute or hole connecting the two. The pigs consume the feces of the users of the toilet, as well as other food.
Pig toilets (Chinese: 猪圈毛坑 zhūquānmáokēng) were once common in rural China, where a single Chinese ideogram (Chinese: 圂; pinyin: hùn) signifies both "pigsty" and "privy". Funerary models of pig toilets from the Han dynasty (206 BC to AD 220) prove that it was an ancient custom. These arrangements have been strongly discouraged by the Chinese authorities in recent years, although as late as 2005 they could still be found in remote northern provinces.
In China, "Family dwellings are commonly built close to the fish pond with toilets overhanging the pond to facilitate fertilization. ... Some pigsties as well as latrines for humans are built on the adjacent dike so as to overhang the pond." But by 1988, these fish pond toilets were falling out of favour, as the farmers found it more useful to ferment human and pig excrement together, and apply it to the aquaculture ponds as needed.
In Vietnam, the traditional fish pond toilet, which was described as "widespread" as recently as 2008, polluted the waterways, but was perceived as more hygienic (less smelly) than various modern alternatives that the government was pressing on the villagers.
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