Spa Boss Chlor-Aid is a stabilized granular chlorine for Hot Tubs and Spas. SpaBoss Chlor Aid is 100% Sodium Dichlor. This powerful sanitizer is fast dissolving and completely soluble which can be used for both regular daily chlorination as well as super chlorination. Chlorine kills all forms of bacteria and algae in Hot Tub water and starts to disinfect immediately. Chlor-Aid does not affect pH or total alkalinity nor promote scale build-up.