Our premium quality Bromine Tablets (approx. 1-1/4" diameter) provide excellent sanitizing for spas and hot tubs, without nearly the odor of chlorine. These maximum potency bromine tablets are slow-dissolving for optimal use in warmer water, so they are more economical to use. Very effective against algae and bacteria. You cannot buy better quality bromine tablets at any price. Product notes: Bromochloro-5, 5-dimethylhydantoin 98%. Guaranteed fresh.