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:

It 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.

Levels should be between 3 and 5mg/l (ppm) are sufficient to maintain healthy, clean water.