How much shock powder should you put in a 15ft by 42 pool?

To determine the appropriate amount of shock powder for a 15ft by 42in pool, you typically need about 1 pound of shock per 10,000 gallons of water. A pool of that size holds approximately 4,500 gallons. Therefore, you would use about 0.45 pounds (or approximately 7.2 ounces) of shock powder. Always refer to the specific product instructions for precise dosing, as concentrations can vary.