just wondering if i can change from chlorine 2 bromine without emptying the spa
Yes you can change to Bromine (http://www.hottubworks.com/HotTubChemicals/) from Chlorine (http://www.hottubworks.com/HotTubChemicals/) without emptying the spa. If you were to go the other way around, changing from Bromine (http://www.hottubworks.com/HotTubChemicals/) to Chlorine (http://www.hottubworks.com/HotTubChemicals/) you would need to empty the spa and start with fresh water.