Aqua Smarte Chlorine Chamber 5lb. 

Aqua Smarte Features:

• Convenience: the pre-filled Cycler Pac means no more touching or smelling chlorine.
• Precision: The control dial precisely meters out just the right amount of sanitation for each pool.
• Longer Lasting: trapped air in the upper part of the Cycler Pac keeps the chemical dry so it lasts longer with less consumed each season.
• Reliability: Water cycles through only a small amount of chemical for more uniform and reliable output