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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 spa or tub having a filter element having a central opening therein;a chlorinator positioned in said central opening comprising a housing and electrode means positioned within said housing and disposed for enabling spa water to pass therethrough while generating hydroxy

1. An apparatus comprising: a spa or tub having a filter element having a central opening therein;a chlorinator positioned in said central opening comprising a housing and electrode means positioned within said housing and disposed for enabling spa water to pass therethrough while generating hydroxyl radicals to remove impurities from the spa water;wherein said chlorinator is suspended in said opening by an electrical cable; andwherein said electrical cable passes through a seal in a wall of said spa and into an equipment area of said spa where the cable interfaces with spa controller circuitry. 2. The apparatus of claim 1 wherein said housing is a cylindrical housing; and wherein said electrode means comprises: 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. 3. The apparatus of claim 2 wherein said cylindrical housing is 1.3 inches in diameter and six inches in length. 4. An apparatus comprising: a spa having a filter compartment and a filter standpipe located therein;a cylindrical housing sized to fit within the filter standpipe and located in the standpipe;an electrode assembly attached at one end of the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart so as to define a water flow path between them; andan electrical cable entering said housing to supply power to said electrodes; wherein said electrical cable is fixed to a standpipe cap assembly to thereby determine the length of the portion of said cable lying within the standpipe, the standpipe cap assembly being shaped and sized to fit a cylindrical opening of said standpipe. 5. The apparatus of claim 4 wherein said electrical cable passes through a seal in a wall of said spa and into an equipment area of said spa where the cable interfaces with spa controller circuitry. 6. An apparatus comprising: a spa having a filter compartment and a spa filter element disposed in said compartment;a cylindrical housing sized to fit within a central opening of the spa filter element;an electrode assembly attached at one end of the housing comprising a plurality of vertically disposed electrodes, the electrodes being spaced apart so as to define a water flow path between them; andan electrical cable entering said housing to supply power to said electrodes; andwherein said electrical cable is fixed to a standpipe cap assembly to thereby determine the length of the portion of said cable lying within the spa filter element, the standpipe cap assembly being shaped and sized to fit a cylindrical opening of said standpipe. 7. The apparatus of claim 6 wherein said electrical cable passes through a seal in a wall of said spa and into an equipment area of said spa where the cable interfaces with spa controller circuitry.