The Gecko in.clear bromine/salt generator generates and releases bromine sanitizer into the spa water, rapidly destroying any microbiological contaminants such as waterborne bacteria, algae, and organic matter given off by spa bathers. This in.clear sanitizing system eliminates the need to add bromine or chlorine to your spa on a regular basis saving you trips to the store and shipping costs. The in.clear system does not produce any offensive odors, it does not cause eye irritation and it's easy to use for the best choice for hot tub sanitation.