Aquarium plants need carbon dioxide (CO2), which is their main nutrient, for vigorous and healthy growth. Without a CO2 fertiliser system, the CO2 content in the aquarium water will always be too low, as it is balanced with the CO2 content of the outside air. Only by using a CO2 fertiliser system can you raise the CO2 content in your aquarium water so that sufficient CO2 is available for your aquarium plants. A Bio-CO2 system does not require a pressurised gas cylinder and is ideal for beginners and smaller aquariums. For larger aquariums, CO2 fertiliser systems with CO2 cylinders are better because they can be easily refilled (m-system) or replaced (u-system). A solenoid valve (v001) enables night switch-off, because plants do not need CO2 during the dark phase and the aquarist saves 50% CO2 by switching off. You can achieve automatic CO2 regulation with a pH/CO2 control unit (pH Control).
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