what are 'black water' and 'grey water' in the context of sewage
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Blackwater contains the pathogens of faeces and the nutrients of urine that are diluted in the flushwater. Water coming from domestic equipment other than toilets (e.g., bathtubs, showers, sinks, washing machines) is called greywater. ... Blackwater is a term dating to at least the 1970s.
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