Transform your murky, green pool into a sparkling, inviting blue swimming pool. HTH Green to Blue Chlorine Granules offer a powerful, fast-acting pool treatment that works in just 24 hours. The two-step granular formula is an effective pool shock treatment, swiftly killing stubborn algae and harmful bacteria. This multi-action product also contains a water clarifier to clear cloudiness and a pH balancer to help maintain optimal pool chemistry. A complete solution for restoring clarity and sanitation, making pool maintenance effortless. Ideal for problematic pools after storms or high bather load. Achieve a crystal-clear pool with this simple, easy-to-use product.