An oxidizing shock that will not affect chlorine levels or pH levels. Swim 15 minutes later! This extremely powerful long-lasting shock is perfect for weekly maintenance, destroying organic contaminants and chloramines and eliminating chlorine odors. Robelle Non-Chlorine Blast is compatible with chlorine, salt and bromine. Packaged in a container that is easy to use, senior friendly, with a child resistant lid. 2 LB container