These products kill bacteria in spa water. 
Includes Bromine and Dichloro.
 

BROMINE TABLETS

Brominating tablet in a 20 g format, with 64% available bromine and 28% available chlorine. Dissolves quickly and requires the use of a floating chlorinator. Controls bacteria in spa waters. This product has a pH of 4.5.

DICHLORO TABLETS

Stabilized chlorinating tablet (dichloro) in a 20 g format with 56% available chlorine. Dissolves quickly and a floating chlorinator is not required. Simply throw the tablet in the spa. Controls bacteria in spa waters. This product has a pH of 5.5 - 7.