AquaChem 25550AQU Pool Chemical, 1 lb, Granular, Chlorine, White

Adding shock to your pool removes contaminants that cause poor water quality. When you add a shock treatment to your pool, you remove contaminants that cause cloudy water, chlorine odor and eye irritation - not to mention preventing future problems and reducing the need for other chemicals. Shock treatment is the economic basic shock treatment for all pool types.