I have a 20,000 gallon vinyl IG in the Boston area. I am eexperiencing staining below the water line on the steps, floor and walls in approximately 15-20 percent of the pool. I have read through the threads with regard to stains and metal matters, all seem to reference chlorine levels when describing how to correct staining problems. I believe that my staining is caused by metals, my question is..........do I follow the same procedures as a chlorine pool when in fact my sanitizer is bromine?? Any advise is greatly appreciated!