ProTeam Quick Shock is an easy and effective way for pool owners to superchlorinate their pools after spring opening, along with shock treatments throughout the pool season. Its granular formula dissolves quickly to establish a chlorine residual of 1-2 part per million (ppm), while eliminating any organic contaminants that have gotten into your pool water. The results of routine use of this product is crystal clear, healthy water that swimmers will love. Quick Shock is made in the USA to ensure quality, allowing you to buy with confidence.