hth spa™ Bromine Tabs is a new form of brominating disinfectant for spas and hot tubs. It is easily adapted to many erosion feeders used to automatically treat both commercial and residential spas and hot tubs. When used as directed, hth spa™ Bromine Tabs will disinfect spa and hot tub water, keeping it clear and free of odour. hth spa™ Bromine Tabs gives the effectiveness of chlorine without the chlorine odour. For proper sanitation, spa and hot tub must be completely drained periodically.