Abstract: An apparatus for producing ozone for use inside buildings and residences and for purifying water. The apparatus includes a generally flat base and a removable cover in generally sealed contact around the perimeter of the base, the cover and base defining an interior volume. An array of closely spaced, preferably non-contacting, parallel ozone producing cells are mounted atop the base within the interior volume. This array is positioned adjacent an air inlet in a side wall of the cover. Air is drawn into the interior volume through the air inlet and is directed against the array by a fan or blower. A blend of air and ozone produced by the array flows from the array for upward discharge from the outlet. The array includes a plurality of dielectric open-ended tubular members, preferably made of PYREX, held in position within closely mating spaced holes formed in spaced upright non-conductive support panels connected atop the base.