Recycling, or reuse of previously used, water is becoming increasingly prevalent in areas where fresh potable water is scarce. Perhaps the most infamous type of water recycled is indirect potable reuse, sometimes referred to as “toilet-to-tap.” But not all recycled water is used for drinking water. Other uses of recycled water include direct nonpotable reuse and greywater.

Domestic wastewater is made up of blackwater and greywater. Blackwater is the waste-water from toilets. Greywater is the wastewater from washing laundry, baths and showers, and sink water with food wastes removed. The majority of the disease risk from untreated wastewater comes from blackwater, due to the large amount of pathogens naturally present in feces. Greywater can be reused for noncontact uses, which do not involve bathing or washing, ...

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