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Blackwater (waste)
Blackwater is used to describe wastewater containing feces, urine and flushwater from flush toilets along with anal cleansing water (if water is used for cleansing) or toilet paper. It is distinct from greywater or sullage, the wastewater generated from washing food, clothes and dishware, as well as from bathing, but not from toilets.〔
==In practice==
Water coming from domestic equipment other than toilets (e.g., bathtubs, showers, sinks, washing machines) is called greywater and it is preferred to be kept separate from blackwater (which comes from toilets) to reduce the amount of water that gets heavily polluted.
Separation of blackwater and greywater nowadays happens with all ecological buildings. Especially in autonomous buildings, the separation is always present. It is also commonly used on recreational vehicles which feature a greywater holding tank and a blackwater holding tank.
Blackwater is a term dating to at least the 1970s〔(US Patent 3915857 ), issued in October 1975〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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