Natural Chemistry Spa Chlorine ConcentrateNatural Chemistry Spa Chlorine Concentrate allows you to quickly add needed chlorine to your hot tub or spa without needing any dispensers or floaters. Simply spoon out the dosage and add directly to water for precise control over the level of chlorine in your spa water. Spa Chlorine Concentrate can be used for routine maintenance or superchlorinating your spa after heavy bather loads or infrequent use, ensuring your system is safe and healthy.