SeaKlear Spa Brominatinge Tablets 3.5 Lb Bactericide-Algaecide-Disinfectant Bromine Formula Tabular Format Spa sanitizers brominating tablets Effective and popular means of disinfecting spa and hot tub water For the first time and whenever the spa is drained or refilled, add 1/2-ounce of sodium bromide for each 100-gallon of water Standard dosage introduce 3 tablets per 300-gallon of spa water with the use of a floating tablet feeder or automatic brominator Available in 3.5-pound