Bio-Dex AttackThe Bio Dex Attack product is an super strong shock oxidizer that will effectively clean the pool or spa, and will not add chlorine to the water. It is only intended to be used as a shock treatment in pools, spas, hot tubs, fountains or ornamental ponds. This is not a sanitizer, and will not replace the need for a regular application of sanitizer such as chlorine or bromine. Super concentrated non chlorine shock oxidizer Fast acting without any odor