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Many of today's spas come with an ozonator. This piece of the spa's filtration system does not do away with the need for chemicals, but with an ozonator you'll use a lot fewer chemicals and your water will stay cleaner longer. Essentially an ozonator creates ozone gas inside the unit, and then injects this gas into the water. The gas purifies the water and kills off much of the bacteria that's always present in spas. By using an ozonator, you can reduce the amount of chemicals in the water and reduce that chemical smell that's so common in many spas. You'll still need to test your water each week, but it should remain more stable and balanced with an ozonator, too.