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.