Just add citric acid, baking soda, water into the bottle, can produce carbon dioxide. Plant metabolism can be increased rapidly, creating the best growth conditions for fish. It is the best choice for making CO2 devices at home. Features: Professional stainless steel cylinder CO2 generator system, best than simple plastic bottle generators. It is more reliable, stable, durable and efficient. The safety valve opens automatically when the pressure is higher than the safety pressure. Bubble counter with check valve: flow gauge of CO2 gas and prevents water backflow into the regulator. Solenoid valve: to turn the CO2 generator system on and off with a timer (not included). Comes with an atomizer, refines the bubbles and facilitates dissolution in water and being taken up by plants. Inject CO2 into your aquarium quickly and easily. Large amounts of CO2 can kill fish. It is recommended to reduce the CO2 volume by 1 or 2 bubbles per second at first. It may take 3-4 weeks for a one-time
