Standing alone, ozone cannot oxidize such compounds as ammonia, urea or amino acids that are all common bather wastes; however, it can oxidize these compounds once chlorine or bromine have combined with them. Ozone only stays in the hot tub water for about 22 minutes, leaving no residual. Ozone is only produced while the filtration system is running. Most hot tubs operate their filter systems on timed cycles and therefore, a backup treatment should be incorporated such as bromine or chlorine. When incorporating ozone into your hot tub you will only need about half of the required sanitizer Even if you use your hot tub infrequently, you will still need to shock it once a week.