Yes the Paramount ozone system uses a UV bulb to create ozone enriched air which is then injected into the pool water right before the pump. The water itself doesnt pass by the UV bulb. It doesnt inject ozone through a random return to the pool. The process is concentrated at the equipment pad at a specific point in the flow. So the ozone is used to help break down non living wastes between the pump and in the filter. Chlorine is produced later on downstream of the ozonator by the swcg which is the last step prior to returning the water to the pool. Per the Paramount information they say killing living organisms (virus, bacteria, algae) consumes only 20% of chlorine in a pool. Oxidation of non-living waste uses up to 70%. The residual 10% is what is left in the water as a "safety net" to maintain water quality until the water circulates through the equipment again.chem geek said:Thanks for your feedback. Your situation is what I would normally expect. Ozone breaks down organics so chlorine doesn't have to so in theory should lower chlorine usage. If anything, the ozone could convert some chloride to chlorine (it is known to convert bromide to bromine). I'll have to look at other things going on in such pools/spas to see where the chlorine usage is coming from and have the people turn off their ozonators to see if the chlorine usage drops. Glad to know it works for you.
You know, I just had a thought and that was that some ozone systems use UV to generate the ozone. In that scenario, the UV could break down the chlorine. Do you have any idea how your ozone system works? If it's from corona discharge rather than UV, then perhaps that explains the difference. I would have expected the UV to expose air that created ozone injected into the water and that the water itself would not get exposed to the UV, but perhaps some designs don't do this.