create multiple sources of ozone typically 6 to 10 corona discharge units 51 are used with each ozonator however it will be appreciated that any number may be provided depending upon the requirements of the system the housing 60 is provided with water cooled tubes 62 which circulate water or other cooling fluid within the ozonator to cool the corona discharge units whereas fig4 illustrates only a partially filled outer housing it will be appreciated that the housing is sized to accommodate the number of corona discharge units and water cooled tubes as can be seen from the schematic of the wash system a continuous closed fluid flow loop is provided in a typical closed loop washing system such as might be found in an institution commercial laundry or the like a series of washing machines 10 each capable of washing a 125 pound load are connected to a source of ozonated water washing fluid held in the water holding tank 14 capable of holding from 500 to 1 000 gallons of ozonated water the machines 10 typically are designed to hold between 30 and 90 gallons of water for a given wash cycle the washing fluid in the holding tank 14 is continuously circulated from the bottom of the tank to the top of the tank using the recirculating pump 26 which pumps the washing fluid from the bottom of the holding tank 14 through a series of filters 28 and 30 back into the top.