A device and method for supplying ozonated liquid is disclosed. Liquid in a reservoir is pumped from the reservoir to a separate ozone generator and is thereby ozonated. The ozonated liquid is retained to the reservoir so that the liquid is circulated in a loop. As the liquid is circulated through the ozone generator, the concentration of ozone increases. Once the liquid has been sufficiently ozonated, the generator is disconnected and the reservoir moved to where ozonated water is required and ozonated water is dispensed from the reservoir.