I recently got a Cal Spa Deluxe for free. It has taken some time to rebuild and I was able to get some parts from another Cal Spa. I am down to bottom of the list of things that need fixing or replaced. I am not sure if the Ozone tube is working but it seems safe to assume it is not. I am not smelling any ozone and it appears there should be a light on when it is running. Mine looks very similar to the Del Zone unit shown on [edit spam url removed - not a valid domain]. I had a spare one (model #OZO18000000) that I tried and the buld was burned out. I am looking to replace this unit and wonder if anyone had any recommendations. I don't want to buy cheap garbage but I don't want to waste money either. Thanks for the help.