Spa pools require regular sanitising to maintain good quality water for bathing. The sanitiser takes on the role of killing bacteria, viruses and algae. The addition of an oxidiser is also essential to burn out organic contaminants that build up over time to cause spa water to go cloudy.
Chlorine is an effective sanitiser and oxidiser and is a common form of sanitiser for spas. However, it is not very stable at high temperatures, causing it to dissipate quickly in a spa environment.
Bromine is perhaps a better sanitiser for spas because it is more stable at high temperatures. Typically, bromine has a small portion of chlorine content as pure bromine is not a good oxidiser whereas chlorine is.
Approximately 5% of bathers have a reaction to bromine. Approximately 17% of bathers have a reaction to chlorine. For this reason, poynters poolside is a specialist in alternative sanitisers.
Ozone is now widely used for spa sanitation. Ozone is much more effective than either chlorine or bromine at sanitising when sufficient ozone is introduced into the water. It is also an oxidiser. Because ozone is simply O3 (oxygen + an extra molecule) it is an environmentally friendly sanitiser. The extra molecule is very unstable and readily attaches to foreign matter to kill and oxidise away. The major limitation with ozone is that because it is so unstable, it doesn't remain in the water for long. This means spa water has no residual of sanitiser. Spas run on ozone should ideally be run 24 hours a day if they are not assisted with a chemical sanitiser. If this is not the case, the spa water must be supplemented with a small amount of either chlorine or bromine.
Poynters poolside also supplies Spa Magic, a natural formula of enzymes and lanolin which can be used as a 100% chlorine free system. It is also compatible with chlorine. Just add one bottle to spa water. It will last for up to three months.
Poynters also has a non-invasive chlorine-free chemical solution called Pool Magic for spas. Just add a dose each month.