Which sanitizer is more effective at higher temperatures?

Bromine is more effective as a sanitizer at higher temperatures compared to other sanitizers. This characteristic makes it particularly useful in hot water applications, such as spas and hot tubs, where the water temperature is typically elevated. The effectiveness of bromine increases because it remains stable and maintains its disinfecting properties in warm water.

Chlorine is effective as well, but its efficiency can be reduced in high-temperature settings due to factors such as increased evaporation and the formation of chloramines, which can diminish its effectiveness as a sanitizer. Ozone is a powerful oxidant but its application and effectiveness can vary depending on the system and water chemistry. Calcium hypochlorite is a form of chlorine and therefore shares similar limitations with chlorine in terms of temperature.

Understanding the unique characteristics of each sanitizer helps pool operators make informed choices based on the specific needs of their pool or spa environment.