Fast-Acting Pool Shock: Instantly boosts chlorine levels to eliminate bacteria, algae and contaminants, keeping your pool water sanitary, healthy and visibly sparkling Pro-Grade Cal-Hypo Formula: Formulated with 68% calcium hypochlorite to deliver a high 68% available chlorine content. Top-notch ingredients for powerful, long-lasting pool maintenance. Sanitizes without adding cyanuric acid (CYA) to prevent chlorine lock Multi-Functional Shock Treatment: Effectively kills bacteria, prevents algae, controls chlorine odor, reduces irritation, and quickly restores crystal clarity, ideal for routine pool water maintenance Compatible with All Swimming Pools: Vinyl-lined, saltwater, above-ground, or in-ground. To avoid bleaching your pool liner, always pre-dissolve or dilute the product before adding it to the pool Dosage: This package contains 12 convenient 1-lb bags. Simply add one bag per 10,000 gallons of water to result in a chlorine level of 5-10 ppm Professional-grade calcium hypochlorite shock, delivering 68% available chlorine for powerful, long-lasting sanitation. Simply add one bag per 10,000 gallons to achieve 5-10 ppm chlorine with no CYA added, preventing chlorine lock. Safe for all pool types, including vinyl and saltwater.