In The Swim Sodium Dichlor Chlorine Shock Granules for Sanitizing Hot Tubs and Spas – Fast Dissolving, pH Balanced Sanitizer - 56% Available Chlorine, 99% Sodium-Dichlor – 5 Pound

Versatile: Granular chlorine with the ability to be used in all types of swimming pools, spas, fountains, and water features.Powerful Sanitizer: Sodium Dichlor shock removes bacteria, breaks down organic contaminants, and eliminates algae.Calcium-Free Formula: Perfect for hard water areas—keeps pool water sparkling clean and crystal clear.Stabilized Chlorine: Contains 56% available chlorine for effective, long-lasting sanitation.Usage Directions: Add 3 oz. per 10,000 gallons for routine chlorination; use 21 oz. per 10,000 gallons for super chlorination