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.

Note:
Excessive or double addition of raw materials and water is prohibited.
Invert the bottle and disassembly are prohibited.

Specifications:
Main material: Stainless steel
Main color: Silver
Voltage: AC 100V-240V input; DC 12V output
3 size optional:
1L: Height: 22.5cm; diameter: 10cm; thickness: 0.12cm;
2L: Height: 47cm; diameter: 10cm; thickness: 0.12cm;
5L: Height: 47cm; diameter: 13cm; thickness: 0.15cm;
Package size:
1L: 34*12*12cm / 13.4*4.7*4.7in
2L: 48*12*12cm / 18.9*4.7*4.7in
5L: 50*14.5*14.5cm / 19.7*5.7*5.7in
Package weight: 
1L: 1000g / 35.3oz
2L: 1705g / 60.2oz
5L: 2705g / 95.5oz

Package List:
1* Stainless steel bottle
1* Solenoid Valve (1L Not included)
1* Bubble diffuser 
1* Pressure reducing valve
1* Bubble counter with check valve
1* Filter
1* 1.5m tube
2* Suction cup
1* Manual