Chlorine is a commonly used chemical to achieve satisfactory bacteriological and chemical purity in spas and hot tubs. It must be present in the ‘free’ form to kill bacteria and oxidise organic matter derived from bathers. Provided the water is balanced, chlorine levels of between 3 and 5mg/l (ppm) are sufficient to maintain healthy, clean water. A well-managed chlorine treated spa or hot tub will have no odour and levels of chloramines (combined chlorine) of less than 0.5mg/l.
Bromine is similar to chlorine in its effectiveness as a sanitiser but there are some important differences that make it an ideal product for using in a spa or hot tub:
Provided the water is balanced, bromine levels of between 3 and 5mg/l (ppm) are sufficient to maintain healthy, clean water.