Establishes an immediate bromide reserve in your spa. Features: For use with brominating tablets in hot tubs Establishes a bromide reserve Applications: Start-Up: Add 1/2 oz. per 100 gallons of spa water to establish a 30 ppm bromide reserve. Add Brom Tabs to establish a bromine level. Repeat steps 1-2 when spa is drained and refilled. Tips: Leisure Time Sodium Bromide is NOT a disinfectant. It is used to establish a reserve of bromide in spa or hot tub water. It is necessary to use a sanitizer to disinfect the water. Compatible with: Bromine sanitizing systems. Sodium Bromide Advantage: When used with Leisure Time Brom Tabs, the disinfection of the spa will be completely bromine-based and chlorinous odors will not exist.