Solus Spa Chlorine is a chlorine sanitizer for spas and hot tubs that dissolves quickly and completely to provide a steady source of available chlorine in your spa. Sanitizing with spa chlorine or another sanitizer is the most important step in maintaining a clean, healthy spa. Bacteria and algae tend to grow more rapidly in hot water, so it's important to keep your sanitizer at the recommended levels at all times. Can also be used as a spa shock treatment. Solus Spa Chlorine will control the growth of algae, kill bacteria and destroy organic contaminants. Simple to use, this spa chlorine will keep your spa crystal clean.