After Shock is a chlorine reducer that is primarily used with Stain Solution #1, “The Iron, Cobalt and Spot Etching Stuff” to reduce the chlorine to below 1ppm. After Shock can also be used to quickly lower chlorine levels after shocking… great for commercial pools!
How should I add After Shock to my pool?
Add the product through the skimmer directly from the container. Be careful not to overdose!
2 ounces removes 1ppm chlorine from 15,000 gallons of pool water. Be careful not to overdose!