Water recycling and reuse
From Equation 5, one can see that water recycling or water reuse will affect
the grey water footprint. When – after treatment when necessary – water is
fully recycled or reused for the same or another purpose, there is no effluent
to the environment, so the grey water footprint will be zero. If after one time
or a number of times of reuse, however, the water is still disposed into the
environment, there will be a grey water footprint, related to the quality of the
effluent of course