HTH, 1.65 LB, Spa Bromine 1" Tablets, Disinfects & Sanitizes Water By Using Slow Dissolving Bromine Tablets In A Floating Brominator Or Other Feeders, Low Odor, Fits All Floaters, Active Ingredient-2.4 Imidazoliinedione, 1-Bromo-3, Chlroro-5.5 60-65%.