The 1 lb Hit Hard 68% Cal-Hypo is a highly effective pool shock treatment designed to maintain clean, clear, and sanitized pool water. With 68% calcium hypochlorite, it delivers a strong dose of chlorine to eliminate bacteria, algae, and other contaminants. The granules dissolve quickly, providing fast-acting results to restore proper chlorine levels and water clarity. The 1 lb bag is perfect for smaller pools or occasional treatments, making it a convenient option for both residential and commercial use.