No waiting to swim - treated water can be used immediately. * Application: Dilute with at least nine parts of water. (See dilution chart on back of bottle.) Sprinkle solution around edge of pool. * Chlorine, bromine and ozone sanitizers, as well as salt water pools. * Apply under sunny conditions for most effective results. Apply initial treatment to a freshly filled pool or at first visible signs of algae growth. * This item is not for sale in Catalina Island