Hot tubs and swim spas are the ultimate havens of relaxation and hydrotherapy. To maintain the crystal-clear waters and ensure they remain safe for you and your loved ones, you have to choose the right sanitizing agent. Bromine and chlorine are two popular options for hot tub and swim spa maintenance. In this guide, we will explore what bromine and chlorine are, how they are used, and the steps involved in switching from one to the other.

Bromine Overview

Bromine is a chemical element that serves as an effective sanitizer for hot tubs and swim spas. It is known for its ability to work well in high-temperature environments, making it a great choice for these water features. Bromine works by releasing bromine ions, which destroy harmful microorganisms and organic matter. It is available in various forms, including tablets and granules, making it easy to administer.

Chlorine Overview

Chlorine, another common pool and spa sanitizer, is well-known for its ability to rapidly disinfect water. It is available in various forms, such as chlorine tablets, liquid chlorine, and chlorine shock. Chlorine works by releasing hypochlorous acid, which effectively kills bacteria, algae, and other contaminants. While it's generally used in swimming pools, it can also be a suitable choice for hot tubs and swim spas.

Switching from Bromine to Chlorine (or Vice Versa):

  1. Test Water Parameters: Before making the switch, test the water parameters using a reliable testing kit. This will help you determine the current condition of the water and the necessary adjustments.

  2. Adjust pH and Alkalinity: Ensure that the pH and alkalinity levels are within the recommended range for your chosen sanitizer. Adjust them if needed.

  3. Remove Existing Sanitizer: If you are switching from bromine to chlorine, allow the bromine levels to drop to zero over a few days. If switching from chlorine to bromine, use a chlorine neutralizer or let chlorine levels dissipate.

  4. Add New Sanitizer: Introduce the new sanitizer according to the manufacturer's instructions. Ensure it is adequately dissolved and distributed in the water.

  5. Monitor and Maintain: Regularly test and maintain your water chemistry to keep it balanced and the sanitizer levels within the recommended range. Adjust the sanitizer as needed.


Whether you choose bromine or chlorine for your hot tub or swim spa, the key is to maintain proper water chemistry and sanitation. Both sanitizers have their advantages, and the choice ultimately depends on your preferences and needs. Making the switch from one to the other is a straightforward process when you follow the steps outlined above. So, go ahead and enjoy the soothing waters of your hot tub or swim spa with confidence, knowing you've made the right choice for a safe and enjoyable experience.