Beachcomber UltraShock (formerly called Bromate) is a highly soluble, granular, finely ground, 100% chlorine-free oxidizing product that contains Potassium Monopersulfate. This oxidizer works alone or in conjunction with other product o create active bromine sanitizer. For activating Ultrashock, you must add to your hot tub water with our liquid Bromide; it creates a ‘bank’ that activates UltraShock, creating hypobromous acid. This reaction releases a powerful bromine sanitizer that kills bacteria, viruses and pathogens in the hot tub water. It also prevents the growth of these harmful organisms. UltraShock can also be used with our Bromo Disc which together creates bromine sanitizer.