OK. Bromine is a chemical that is being used to sanitize, but what if you have an ozonator? Do you need bromine/chlorine? I have a new working ozonator and have been maintaining and testing for PH but not bromine.

While you will have to use less chemicals to keep you water in good balance with an ozone unit, you will still need a sanitizer like bromine or chlorine, so continue testing your water and make adjustments based on the results. I would suggest continued monitoring.