The bromine purification system (salt) for the hot tub water is increasingly popular. The system produces and allocates bromine in the water of your hot tub and eliminates the need to add bromine or chloride on a regular basis. The maintenance is simplified. The system avoids the undesirable effects such as odors and eye and skin irritants. Some prefer it for ecological reasons and by concern for the environment.At Piscines FunTime Pools & Hot Tubs the Hydropool brand self-cleaning hot tub is sold with the integrated bromine purification system.