Spa Boss Brominating Tab controls bacteria & algae in spa waters. Bromine tabs disinfect and oxidize foreign matter from pool or spa water and destroy bacteria and algae. Bromine tabs have less odour than chlorine and will not cause eye or skin irritation to most bathers. Bromine tabs also work at a wider range of pH levels than chlorine does, making it a more popular choice for hot tubs. Tabs require water flow to dissolve and should be placed in a floating dispenser and should not make direct contact with the spa or bleaching can occur. In most cases, a level of 3-5 ppm of bromine should be maintained on a daily basis.