The bathtub water temperature is maintained between 36°C and 40°C. While this temperature is comfortable for humans, it's ideal for bacteria that thrive in warm environments. Legionella and Pseudomonas aeruginosa multiply rapidly at this temperature, and without regular water changes or disinfection, bacterial numbers can increase rapidly.

Spa jacuzzi tubs typically operate between 36°C and 40°C, a temperature range that is very close to but slightly above human body temperature. This temperature range has the following positive effects on the body: · Vascular dilation · Muscle relaxation · Nerve relief · Metabolic activation