Premium shock blend that combines Dichlor, Algaecide, and Stabilizer for a 3-in-1 formula that solves pool problems fast Di-Zap Pool Shock is safe for use on all surfaces and has a fast dissolving formula that can be added during the bright sun Premium 3-in-1 shock is ideal for routine maintenance and provides an effective quick chlorinating boost Ideal for use in pools, spas, fountains, and water features Dosage: 1 Pound per 10,000 gallons