GLB 71421 25 lbs Generation 2 Bromine Tablets GLB 71421 25 lbs Generation 2 Bromine Tablets - Bromine is for use in disinfecting and oxidizing pool and spa water. It clears cloudy water by killing bacteria and destroying contaminates. Whether being used for new pools or spring openings, regular water maintenance, or as part of the winterization process, bromine is the perfect cleaner for any pool or spa. It is an excellent choice for those with a chlorine sensitivity.