EXCELLOFIZZ. This product is used to increase the amount of CO2 in small growing areas without the use of bottle tanks. Excellofiz emits the proper CO2 levels for indoor plants by reacting and giving off pure CO2 gas and also absorbing oxygen from the air. Simply place one of the Excellofiz pucks into the container provided. Pour 2-1/2 ounces of water into the container and leave the lid open slightly. Excellofiz will then slowly react emitting the proper amount of CO2 gas for approximately 5 hours into the photoperiod. Excellofiz will then continue to increase CO2 levels after the reaction has completely subsided by absorbing oxygen from the air. Each puck when reacted will emit enough CO2 gas in a 10' x 10' area to raise the level by approximately 1600ppm. This will give a total of 1900-2200ppm for optimum growth.