A method of growing algae in a cultivation container is disclosed. In some the method may include: circulating, via the cultivation container, in a closed loop, a first predetermined amount of gas mixture comprising a first type of gas and at least one second type of gas, the gas mixture may enter the container via one or more entrance spargers and exit via at least one exit pipe, the first type of gas may contain CO2 at a known first amount; receiving signal indicative of the amount of CO2, in the gas mixture; when the signal indicates that the amount of CO2 drops below a first predetermined level, extracting a second predetermined amount of the gas mixture from the cultivation container: and adding an amount of the first type of gas to the gas mixture, equal to the second predetermined amount.
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