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Adding an oxidizer to a bromine tub will recharge the bromine. Â Chlorine acts as an oxidizer to bromine, same as mps. Â The bromine just stays and gets recharged unlike chlorine that disappears. Â It becomes this never ending circle. Â That is why you can add chlorine to a bromine tub and it remains a bromine tub. Â Now if you add bromine to a chlorine tub, you have just converted to bromine.Once a bromine tub, always a bromine tub...until you drain, clean and fill.