If they can manage to ...

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If they can manage to separate grey water (waste water from kitchen and bathrooms) and black water (from the toilet) then greywater can be used for flushing in the toilets just after the primary treatments. As in one flush, we normally use 10 litres of water so the use of grey water for this purpose may have a significant impact on water use. Additionally, primary-treated greywater can be used for gardening too.