Clorox Spa® Brominating Granules are easy-to-use low-odor granules to sanitize your spa water quickly. Specially formulated quick dissolving granules will keep it sparkling clear and odor-free water. Use Clorox Spa® Brominating Granules regularly to maintain balanced spa water. An unkept spa can quickly grow harmful bacteria due to the 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.