Feature: 1. Professional CO2 generator system with stainless steel bottle, better than simple plastic bottle generators. It is more reliable, steady, durable and efficient. 2. Safety valve will open automatically when the pressure over the safe pressure. 3. Bubble counter with check valve: Flow-rate of CO2 gas indication device and prevent water flow back into the regulator. 4. Large amount of CO2 may cause fish dead. It is recommended to reduce the CO2 volume at the beginning, 1 or 2 bubbles per second. One time\u0027s reaction can last for 3 to 4 weeks using. 5. Any problem, please contact our store without hesitation. Honor to serve you! Specification: Specification: Name: CO2 generator system Main material: Stainless steel Main color: Silver 1L: Height: 29.5cm; diameter: 8.6cm; thickness: 0.12cm; Raw material ratio： 1L: Citric acid 100g+baking soda 100+water 150g . Package List: 1 x Stainless steel bottle1 x Pressure reducing valve1 x Bubble counter with check valve1 x Pressure gauge1 x Built in safety valve1 x Fine adjusting valve1 x ABS multiple filter1 x 1.5m tube2 x Suction cup1 x Manual Note: Excessive or double addition of raw materials and water is prohibited. Invert the bottle and disassembly are prohibited.The appearance of the pressure gauge is random.