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An oxidizer generating apparatus comprising a cylindrical housing and an electrode assembly attached at one end of the housing comprising at least three vertically disposed electrodes, the electrodes being spaced apart so as to define a water flow path between them, the electrodes comprising titaniu

An oxidizer generating apparatus comprising a cylindrical housing and an electrode assembly attached at one end of the housing comprising at least three vertically disposed electrodes, the electrodes being spaced apart so as to define a water flow path between them, the electrodes comprising titanium outer electrodes and at least one inner diamond electrode.

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1. An apparatus comprising: a chlorine generating device comprising a housing sized to fit within a central opening of a portable spa filter, and an electrode assembly positioned within the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart from one a

1. An apparatus comprising: a chlorine generating device comprising a housing sized to fit within a central opening of a portable spa filter, and an electrode assembly positioned within the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart from one another; andan electrical cable extending out of said housing and having a length selected to position said housing in said central opening and to extend to an interior surface of a portable spa. 2. The apparatus of claim 1 wherein the length of said electrical cable is selected to extend to an interior surface of a portable spa, through that interior surface, and into an equipment area of the portable spa. 3. The apparatus of claim 2 wherein said electrodes are configured to interact with fluid flowing through said housing to generate a plurality of hydroxyl radicals. 4. The apparatus of claim 1 wherein said electrodes are configured to interact with fluid flowing through said housing to generate one or more hydroxyl radicals. 5. The apparatus of claim 1 wherein said housing is 1.3 inches in diameter and six inches in length. 6. The apparatus of claim 5 wherein the length of said electrical cable is selected to extend to an interior surface of a portable spa, through that interior surface, and into an equipment area of said spa. 7. A chlorinator assembly comprising: a housing sized to fit within a central opening of a portable spa filter;an electrode assembly positioned within the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart from one another;a cap configured to close a said central opening, the cap having a rim and a cylindrical pipe section extending below the rim; andan electrical cable extending out of said housing and passing through said cap, the electrical cable having a length selected to position said housing in a said central opening and to extend to an interior surface of a portable spa. 8. The assembly of claim 7 wherein the length of said electrical cable is selected to extend to an interior surface of a portable spa, through that interior surface and into an equipment area of the portable spa. 9. The assembly of claim 8 wherein said electrodes are configured to interact with fluid flowing through said housing to generate a plurality of hydroxyl radicals. 10. The assembly of claim 7 wherein said electrodes are configured to interact with fluid flowing through said housing to generate one or more hydroxyl radicals. 11. The assembly of claim 7 wherein said housing is 1.3 inches in diameter and six inches in length. 12. The assembly of claim 7 wherein said interior surface is an inner wall of a portable spa. 13. The assembly of claim 7 wherein said cap has a circular rim, the rim having a larger outer diameter than an outer diameter of said cylindrical pipe section. 14. An apparatus comprising: a chlorine generating device comprising a housing sized to fit within a central opening of a portable spa filter, and an electrode assembly positioned within the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart from one another;a cap configured to close a said central opening, the cap having a rim and a cylindrical pipe section extending below the rim; andan electrical cable extending out of said housing and passing through said cap, the electrical cable having a length selected to position said housing in a said central opening and to extend to an interior surface of a portable spa. 15. The apparatus of claim 14 wherein the length of said electrical cable is selected to extend to an interior surface of a portable spa, through that interior surface and into an equipment area of the portable spa. 16. The apparatus of claim 15 wherein said electrodes are configured to interact with fluid flowing through said housing to generate a plurality of hydroxyl radicals. 17. The apparatus of claim 14 wherein said electrodes are configured to interact with fluid flowing through said housing to generate one or more hydroxyl radicals. 18. The apparatus of claim 14 wherein said housing is 1.3 inches in diameter and six inches in length. 19. The apparatus of claim 14 wherein said interior surface is an inner wall of a portable spa.