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Spa Ozonator Replacement Wiring Made Simple When replacing a spa ozonator, you may find the old unit uses Red, Blue, and Green wires, while the new ozonator has only Black and White. Here’s how to connect them correctly. Old ozonator wiring Red or Blue: Power (hot and neutral) Green: Ground New ozonator wiring Black: Hot (line) White: Neutral Some new ozonators do not include a ground wire How to connect Connect one old Red or Blue wire to Black (hot) Connect the other Red or Blue wir …