No more waiting after re-filling your spa! Add Go Brom to new fill hot tub spa water 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. Can also be used in conjunction with Blitz Shock as part of a 2-part sanitation system that is completely chlorine free (for people with chlorine allergies).