One of the mysteries of the English language finally explained.
Waste water from toilets.Compare with gray water
- ‘After consumption, about 80 per cent of the water comes out as waste and this includes black water and grey water.’
- ‘The sludge disaster was the nation's worst-ever black water spill.’
- ‘Another plan used grey and black water output to construct a wetland.’
- ‘You can use water - not your drinking water, but gray water, or water that has been used before but is not yet dirtied to the point of black water.’
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