The most common ozone generator on the market is the ultraviolet (UV) lightbulb. UV light naturally converts O2 to O3. The ozone gas created is introduced into the spa water, using the venturi system, via a small jet usually located in the footwell of the spa. Being a lightbulb, this system will last approximately 1 year before it no longer produces ozone gas. As you can see, over time this system will continue to deteriorate.
Another system available, is what’s called a corona discharge (CD) ozonator. Lightening naturally converts O2 to O3. A CD unit creates ozone by arcing, therefore simulating lightning, inside an enclosure. CD ozonators will create ozone for usually 2 to 5 years. The ozone gas itself is again brought in to the spa using the venturi system. Something to think about with both of these systems, using venturi to move the ozone into the spa means this will only be accomplished when the spa pump is running. So either the tub has to be in a filtration cycle, requiring heat or someone has turned on the jets manually. Therefore, ozone will be pumped into the water approximately 8 hours per day.
Either of these systems is better than none at all and each has a different price tag, so ask yourself which one is best for your spa.
