I have read a little about this and have come away very confused in truth. I believe that grey water is the none toilet water that is already used in the home and the aim is in reusing it for things like garden irrigation.
In that case-must it be treated? Why are people using so much energy to treat it-isn’t it counter productive to use huge amounts of energy to save a little water?
And what is brown water-is that from the loo? Adam, do you try and reuse water yourself?






