Water savers, recycling, grey water system and rainwater tanks in Australia. Reduce, recycle and reuse water to help mininise water loss and leakage around your home. See also Solar hot water If you are thinking about hot to save water washing your car, get a car wash business that has been audited at 12 litres water use per standard vehicle or less. Similarly, mobile dog wash businesses are more water efficient than using the garden hose to wash your dog. Every water saving option not only saves water - but helps reduce water bills.