Sani Marc 30-92055-07 Pure 7Kg Bromine Disc is a slow dissolving Bromine tablet that kills bacteria, contaminates, and algae in water. More effective at higher temperatures than chlorine, Sani Marc Bromine products are perfect for cleaning any spa or hot tub. While still chlorine based, Bromine is less abrasive on the skin and less hard on the lungs making it an excellent choice for those with a chlorine sensitivity or asthma. Enjoy clean and clear water with Sani Marc cleaning products.