Bromo Blast is a granular disinfectant and shock treatment product. When added to water, it is a highly effective one step shock treatment that creates Hypobromous Acid, which kills bacteria, viruses and pathogens in the water. It also prevents the growth of these harmful organisms in hot tub water. Bromo Blast is highly soluble, dissolving quickly to provide a very effective Bromine Sanitizer in hot tub water. Bromo Blast has a pH value of 6.5.