Bromine is an alternative to chlorine. Bromine comes in both tablet and granular form. But, bromine tablets are used far more often in swimming pool than granular bromine. Most chemical manufacturers of bromine do not even package or sell granular bromine in bulk (25 LB or 50LB buckets).

There are certain differences between bromine and chlorine. Bromine is more stable than chlorine at higher (hotter) water temperatures. This explains why bromine is an overwhelming choice to sanitize, disinfect and oxidize spa water.