Grey water is defined as water from baths, showers, hand basins and clothes washing machines or the laundry. Any water from any other source ( toilet water, water from the kitchen and bidets) is considered black water, and must be allowed to proceed to the sewer, and be treated by some sort of sewerage treatment works. A bath uses 120 litres and a shower 80 litres of water. When used, that water is called grey water. You pay for it, and then it all goes down the drain. You can use this grey water to immediately irrigate your garden, saving you a substantial portion of your water bill.
