Add Go Brom to newly filled spa or hot tub for an instant bromine residual. Just add bromine tablets or shock immediately after using Go Brom to activate. Reduces the amount of bromine and time it takes to reach the ideal bromine reading of 1-3 ppm. Go Brom can also be used in conjunction with Renew Shock as part of a 2-part sanitation system that is completely chlorine free (for people with chlorine allergies). Active Ingred.: 99% Sodium Bromide. Dosage: 1 oz. per 200 gallons.