Abstract: An ozone generator has a central metal bristle brush electrode with a metal cylindrical electrode separated from it by a Pyrex cylinder. The electrodes are contained in a sealed cylinder having an inlet for air at one end and an outlet for ozone containing gas at the other end. A transformer connected to the electrodes provides a voltage high enough to create an ionizing electric field between the electrodes. Ozone generation is initiated in response to a demand for treated water which occurs in one embodiment when a well pump turns on, and in another embodiment when a faucet is turned on. A compressor is used in conjunction with the well pump, and an aspirator is used in conjunction with the faucet.