HydroChlor Whirlpool Antiseptic is designed to be used to sanitize shared Whirlpools and is Hazmat certified. The water-dissolvable packets are easy to use and highly effective with hydrotherapy treatments. Fill the whirlpool to desired level, drop in the required size of HydroChlor packet and agitate 2-3 minutes. This professional-grade formula contains 100% Chloramine-T, proven to be an effective way to sanitize. Excellent and trusted for professional use.