One of the problems with ozone is the upfront cost. Typically in the neighborhood of $5,000. Ozone units can and will go out, many between 1 and 3 years of operation. I know because we manufacture Ozone Generators. Being a manufacturer, we can rework them at a fraction of the cost of a new one. Finding a good warranty is key too.
There are lower cost alternatives such as chlorine dioxide injection. If done properly, there are little or no corrosive effects, much like city water.
Air-sparging is a joke in a car wash. They offer this so they can sell a system cheaper and then turn around and nail you for the Ozone system. You end up paying dearly in the end. All too often, by the time that happens you have lost many of your customers.
I can't stress enough how important it is to get the right reclaim equipment to begin with. It may cost you more upfront but it will save you a lot of money and headaches down the line, making it well worth the extra investment.