GLB Supersonic 73% Cal Hypo Granular Chlorine Shock | 25 lb Pail

SuperSonic sanitizes, clarifies, fights algae and won’t overstabilize pool water. It’s safe for use on all pool surfaces and leaves no residue.

• Contains 73% available chlorine.
• Add 1 lb. per 10,000 gallons directly to the pool.
• For best results, add during the evening hours.
• Compatible with chlorine and salt water chlorine sanitizing systems.