Greywater is re-usable wastewater from washing machines, showers, baths and basins. Greywater regulations vary from state to state and it’s important to be aware of local state and council rules. By saving your greywater and reusing it in your garden, you are taking pressure off the water table and undoubtedly saving you on your water bill. Using a water tank to store greywater is an ideal solution to implement sustainable water saving practices in your house.
http://www.yourhome.gov.au/water/wastewater-reuse