SeaKlear Spa Balanced Shock Oxidizer for Spas & Hot Tubs, 2 lb Works quickly - resume use after just 15 minutes Removes odors and chlorine smell Uses active oxygen, not chlorine Eliminates organic contaminants, suntan oils, and perspiration Made in the United States Balanced shock oxidizer contains a high level of active oxygen and minimizes ph fluctuation Works quickly - resume use after just 15 minutes Removes odors and chlorine smell Uses active oxygen, not chlorine; eliminates organic contaminants, suntan oils, and perspiration Available in 2-pound