Spa Pure Brom BankSpa Pure Brom Bank Spa Pure Brom Bank is a liquid solution of bromide salts, which remain in your spa as a stable bank until spa shock is added to the water. Brom Bank has no sanitizing properties until each time you add shock to your spa, then Brom Bank releases bromine into the water. Features: Bromide salts for hot tubs Liquid solution that provides a stable bank of bromine in the water Recommended for use with bromine tablets Size: 16 Ounces