Spa 56 Chlorinating Granules are specifically formulated for spas and hot tubs. The concentrated granular chlorine effectively sanitizes and disinfects hot water. Sodium dichloro-s-triazinetrione dihydrous 55% available chlorine.

Residual chlorine must read between 2 to 3 parts per million. Frequent checks of chlorine levels are necessary. Test spa water for chlorine levels with the Complete Series Test Kit.