Abstract: Apparatus and methods for purifying the water in spas or hot tubs are provided. Such apparatus include an ozone generator sized and adapted to purify the water in a spa or jetted tub, the ozone generator including a chip electrode assembly adapted to produce ozone from air using an electric discharge; and a transfer assembly cooperating with said ozone generator to pass ozone produced by the ozone generator to the water in the spa or jetted tub.