Bromine Disc is a slow dissolving Bromine tablet, weighing 20 grams / .71 oz each. These discs are designed to fit perfectly into a ‘Floating Dispenser’. The constant contact with the water releases Bromine Sanitizer 24/7 into the hot tub water which kills bacteria, viruses and pathogens. It also prevents the growth of these harmful organisms in hot tub water. Bromine Disc has a pH value of 4.0.