Rapid Dissolving Concentrated Sanitiser Brominating Granules provide an alternative water sanitiser to Chlorine Relax spa bromine granules are highly effective granules to boost Bromine for sanitization and algae control of Spa Water. These Granules are relatively ph neutral. 1. Maintain pH levels within the ideal range 7.2 - 7.6. If the level is not in this range adjust. 2. Maintain bromine residuals within the rage 3-5mg/L (ppm) Freshly filled spas require initial shock or start up dose of 50mg/L (ppm) for 1 hour or 20mg/L (ppm) for 2 hours. 3. Apply this product directly to your spa water whilst the spa pump(s) are on to aid distribution. 4. If using this product for shock treatment, allow 30 minutes before bathing recommences.