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HTH Pool Care Green to Blue, Advanced Shock System, 2 Step Solution Green to Blue, 1 Kit The HTH® Super Green to Blue Advanced Shock is a 2-part system. Pack I shocks your pool with a boost of chlorine, helping you fend off bacteria. Pack II is a powerful flocculant that drops particles to the bottom of the pool for easy vacuuming. Both packs work together to create beautiful, crystal clear pool water within 24 hours. How To Use HTH® Green To Blue Advanced Shock System: Simply follow the on-pack instructions for both Pack I and Pack II. Pack I is the Cal Hypo Shock and Pack II is a flocculant that drops dead particles to the bottom of the pool for easy vacuuming. Fight a severe algae bloom and transform your swimming pool water from green to blue in 24 hours with this easy-to-use system. * Transforms water from green to blue in 24 hours * Simple 2-step system * Pack I is a strong algae-fighting pool shock with Cal Hypo * Pack II is a powerful flocculant that drops particles to floor for easy vacuuming * Easy to use About HTH® Pool Care HTH® was developed with the pool owner in mind. We know that maintaining your pool water can be a lot of work. That’s why we're here every step of the way, helping you clear the uncertainty from pool care. With economical, easy-to-use solutions, HTH® is designed to work hard so you're prepared to tackle whatever life throws in your pool. From balancing your water to treating green water, we offer a full line of products to keep your pool water y and your swimmers happy. Visibly brilliant sparkle This Cal Hypo based formula transforms water from green to blue within 24 hours without adding cyanuric (CYA) to prevent over-stabilization or chlorine lock. Compatible with all swimming pools This product is effective for all pool types that can vacuum to waste. It’s ideal for vinyl-lined pools and won't fade liners. You're all clear with HTH® For best results, use with HTH® 6-Way Test Strips to test and balance your swimming pool water twice weekly.