Clorox Spa® Brominating Tablets can be used for low-odor sanitization in hot tubs and spas. The slow-dissolving tablets keep your spa water sparkling clear and odor-free. In addition, brominating tabs kill bacteria and make your spa water less pH sensitive. Bromine is the most common method of sanitizing spas, available in multiple sizes. Make sure you use bromine tabs in your spa regularly. An unkept spa can quickly grow harmful bacteria from a wet, hot environment. Test your spa water frequently to maintain a pH balance of 7.2-7.6 and 3-6 ppm of bromine. Drain, clean and refill your spa every 90 days.