I don't have any experience with bromine. However I did do a little research and it seems to react the same as chlorine during stain treatment. So you would follow the same instructions. I would try adding a sequestering agent, lowering the ph down to 7.2-7.4 and let circulate for 2 hours. Check the ph if it is any higher than 7.2 add a little muriatic acid. Sometimes the low ph with the sequestering agent will lift new stain. Make sure you put at least as much sequestering agent in as the bottle says. If the stain does not go away in 24 hours you may need to do an ascorbic or citric acid stain treat. Sometimes it will bring down your chlorine or bromine, so when you raise it - you should always raise it slowly. High ph along with high chlorine (or bromine) is what causes metals to fall out of solution and stain the surface of the pool. If you have any other questions feel free to ask