CDS liquid chlorinator (pool shock) for swimming pool water disinfection provides instant gratification when added to pools and has no wait time to swim. Less expensive to use than granular chlorine. No scaling when compared to granular products that can lead to excessively high calcium/stabilizer levels which can cause scaling. Liquid pool chlorinator is one of the best options to reduce cyanuric acid levels. Ready to use - No mixing is required. Great for bacteria and algae control. Does not cloud the pool. 1 gallon