Does pool shock have a shelf life?

Yes, pool shock has a shelf life and it is important to check the expiration date before using it. The shelf life of pool shock depends on the type of shock being used. Chlorine shock, which is the most common type, typically has a shelf life of 1-3 years when stored properly in a cool, dry place. Calcium hypochlorite shock, also known as cal-hypo, has a shorter shelf life of 6-12 months. Non-chlorine shock, such as potassium monopersulfate or bromine shock, typically has a shelf life of 1-2 years. It is important to note that exposure to moisture and heat can shorten the shelf life of pool shock, so it is important to store it in a cool, dry place.