SpaPure Brominating Tabs provide a concentrated source of active bromine that is ideal for hot tub sanitizing. This product creates a faster bromine residual for spa start-up. They dissolve slowly and evenly, and they fit in most spa feeders and floaters to provide continuous sanitation of your spa. This product will give you the effectiveness of chlorine without the chlorine odor. SpaPure Bromine Tabs are slow dissolving and disperses evenly Fits in most spa feeders and floaters Effectiveness of chlorine without the chlorine odor Directions NEVER mix different products together in the same bottle, pail, or similar container. Adjust pH of spa water to the range of 7.2-7.6. If spa is freshly filled and before initially using this product in the spa or hot tub add sodium bromide, according to the label's instructions, to introduce a bromine residual of 2-4 ppm. Check feeder regularly to ensure that this product is continuously introducing bromine to the water. When empty or when levels are low, add additional product as necessary to maintain a bromine residual. To ensure sparkling clean water and that your spa chemicals work effectively, water in spas should be changed every 60-90 days. Commercial spas should have the water changed every 3 to 5 days. Do not re-enter spa or hot tub until bromine residual is 4 ppm or less as determined by a bromine test kit. Ingredients Bromochloro-5, 5-Dimethylhydantoin: 98% Other Ingredients: 2%