SpaGuard's Chlorinating Concentrate provides spa owners with the sanitizing power of chlorine in a quick-dissolving granular form, making application quick and easy. Simply add to spa water while the pump is running, and they dissolve completely to start disinfecting your spa. Chlorinating Concentrate is also pH neutral to ensure no affect on your chemically-balanced spa water. This concentrate can be used in regular doses as a sanitizer, and in shock doses as an oxidizer.