Under certain water conditions the free chlorine hypochlorous acid HOCI in a swimming pool decomposes according to the law of uninhibited decay After shocking a pool the pool boy Geoff tested the water and found the amount of free chlorine to be 2 6 parts per million ppm Twenty four hours later Geoff tested the water again and found the amount of free chlorine to be 2 2 ppm What will be the reading after 3 days that is 72 hours When the chlorine level reaches 1 0 ppm Geoff must shock the pool again How long can Geoff go before he must shock the pool again After 3 days or 72 hours the amount of free chlorine in the pool will be Do not round until the final answer Then round to the nearest hundredth as needed ppm