If you don’t want to use chlorine in your spa then you can use sodium bromide salt just fine with the ColorChlor, TechniChlor and MiniChlor to make bromine instead. Sodium Bromide is more expensive than sodium chloride and you can get it in liquid or powder form. You will need about 3000 PPM so start with about 2 pounds per 100 gallons.
If you use NACL – sodium chloride with a chlorine generator you will get chlorine as the sanitizer.
If you use NABR – sodium bromide with a chlorine generator you will get bromine as the sanitizer.
There are a few bromine generators for hot tubs and spas out there. Do not use them with regular salt (NACL), they can only make bromine.