For example, up to 10,0 0 0 L of wastewater a day can be generated at a commercial car wash station in Geelong, Australia. This equates to in excess of 3.5 million litres per annum of wastewater which is disposed of rather than recycled. If this is extrapolated across the more than 10,0 0 0 car wash facilities in Australia, it would represent over 35 billion litres of wastewater per annum.