25lb 1 inch Bromine Tablets. Bromine is a great alternative to chlorine for your pool sanitization needs. Because it is not stabilized; it is ideal for use in spas and indoor pools. Compared to chlorine; bromine is a much more effective sanitizer is a broader range of pH. It also has the ability to be regenerated to its active state with the use of chlorine shocks; non-chlorine shocks or ozone.