The reason that sanitisers are used in spas is to ensure that the water is healthy by preventing and killing bacteria. This is achieved by continuously and consistently maintaining a level of sanitiser (disinfectant) in the water with either chlorine or bromine.
Chlorine is a commonly used chemical to achieve satisfactory bacteriological and chemical purity in spas. 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 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:
Bromine is softer than chlorine & causes little or no eye, skin and nasal irritation. Also there is not the pungent smell sometimes associated with certain types of chlorine treated spas.
Bromine retains better levels of efficiency over a wider pH band than chlorine, which makes it ideal for spas as the pH can fluctuate a fair amount.
Provided the water is balanced, bromine levels of between 3 and 5mg/l (ppm) are sufficient to maintain healthy, clean water.