Just add citric acid, baking soda, water into the bottle, can produce carbon dioxide. The plant metabolic rate can be increased quickly, create the best growing conditions for fishes. It is the best choice of making CO2 equipment at home. It is easy, safe and economical. Package List: 1* CO2 generator system 1* Solenoid 1* Bubble counter with check valve 1* Pressure gauge 1* Safety valve 1* Fine adjusting valve 1* 1.5m tube 2* Suction cup 1* Manual Note: Don't open bottle directly when there's still on pressure, please wait for its automatic pressure release. This product does not include reaction bottles. Specification: Main material: Aluminum alloy Main color: Silver 3 type optional: CO2 generator system/CO2 generator system+bubble counter with check valve/CO2 generator system+bubble counter with check valve+solenoid Raw material ratio? A bottle: Citric acid 200g+water 600g B bottle: Baking soda 200g+water 200g Features: Solenoid valve: To control the on and off of CO2 generator system using with a timer(not included). Bubble counter with check valve: Flow-rate of CO2 gas indication device and prevent water flow back into the bottle. Equipped with a safety valve, the pressure is greater than 4kg pressure will relief automatically, carbonated beverage bottle pressure is 8kg, safety is ensured. The safety valve supports manual pressure relief. When the pressure is below 4kg, it can be manually relieved by pull the ring of the safety valve. It is very safe. Any problem, please contact our store without hesitation. Honor to serve you! Read more Product Details: 12V miniature waterproof solenoid valve AC 100-240v wide voltage input, DC 12v output. better safety than the old 220v solenoid valve, stable and no noise. Waterproof design, avoid the danger of electric shock from water. Cooperate with the timer, which can be synchronized with the light to achieve the automatic management of CO2 outlet and shutdown. Trim valve & Generator body Trim Valve: Upper opening design for easy conenection of bubble counter Generator Body: Replaces tedious tube, with longer service life and anti-corrosion Pressure gauge & Bubble counter with check valve Pressure gauge: Tailored for aquarium low pressure Bubble counter with check valve: Precision internally designed check valve Read more Operate Steps: Step1 & Step2 Step 1: Add the raw material Step 2: The generator is connected to the bottle Step3 Step 3: Start the reaction to form carbon dioxide Comparison for air output and service time The service time is proportional to the air output; Excessive air output may lead to the death of fish. Due to factor such as the quality of raw materials used by individuals and the amout of air output, the data will be inaccurate. Read more 3 Usage Scenarios Optional: Read more Read more Aquarium CO2 Splitter Regulator Valve Distributor Measuring Cup and Funnel for Aquarium DIY CO2 Generator System Kit Aquarium CO2 Fine Adjusting Valve Aquarium CO2 Glass Drop Checker PH Long Term Monitor Fish Tank Test Kit Aquarium CO2 Solenoid Valve CO2 System Regulator Aquarium CO2 Solenoid Valve CO2 System Regulator