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Because "black water" means "water that we can't use", and "grey water" means "water that we can use".

The definition of grey water is that it is waste water that is safe to use (other than for drinking) without treatment. The definition of black water is that it is waste water that requires treatment before re-use. If you have water that you can use, then by definition it isn't black. If you have black water, then whatever reason that it is black is the reason that you can't use it.

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11y ago
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11y ago

using grey water is agood thing because it helps a plants to grow faster, and because it has a chemical that helps planst

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Q: Is using grey water a good or bad for the environment?
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