Feature:1. Be made of aluminum alloy. It is strong, durable and efficient. Well-sealed caps and pipes, leak-proof, non-deformed, never loose. Professional pressure guage for pressure watching. Cheap, simple to create pure CO2 constantly by chemical reactions.2. 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.3. Equipped with a safety valve, the pressure is greater than 4kg pressure will relief automatically, carbonated beverage bottle pressure is 8kg, safety is ensured.4. 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.5. Come with a bubble diffuser, refine the bubbles and make it easy to dissolve in water and be absorbed by plants. Inject to your aquarium with CO2 quickly and easily.Specification: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 for making CO2 equipment at home. It is easy, safe, and economical. Raw material ratio: A bottle: Citric acid 200gandwater 600g B bottle: Baking soda 200gandwater 200g.Specification:Name: DIY CO2 generator systemMain material: Aluminum alloyMain color: SilverRaw material ratio:A bottle: Citric acid 200gandwater 600gB bottle: Baking soda 200gandwater 200g.Package List:1x CO2 generator system1x Solenoid1x Bubble counter with check valve1x Pressure gauge1x Bubble diffuser1x 1.5m tube2x Suction cup1x Check valve1x ManualNote:1. The package does not contain containers for reaction raw materials. Please prepare 2x 1.5L or large plastic beverage bottles (plastic bottles are the best). Do not use bottles or beer bottles to avoid bottles accidentally cracking or exploding due to excessive pressure in the bottle.2. Boost pressure operation: If the pressure gauge shows that the pressure is too low to reach 1KG, the boost pressure operation is required. The customer needs to open the trim valve to release the gas, then close the trim valve and shake the bottle (the AB bottle is shaken together) in order to reach the raw materials faster. Repeat the operation, and then observe the pressure until the pressure rising. If the pressure achieves the ideal pressure you could stop the operation. The best starting pressure is 1KG.3. Don't open the bottle directly when there's still on pressure, please wait for its automatic pressure release.