As an indispensable role to the photosynthesis of water plants, this CO2 generator main for provide a real environment for plants' growing. The equipment uses an irreversible chemical of strong acid and strong base to produce CO2 gas. The pressure principle push the acid liquid into the small soda liquid,the two liquids reacting to produce continuous carbon dioxide. Baking soda+citric acid / alum+baking soda / acetic acid+baking soda, etc. Easy to operate and designed for low cost planted tank use,to provide your aquarium plants a CO2 environment for better growing.