Features:

• Constant pressure output through pressure reducing valve, no need to adjust the needle valve frequently. Handmade at home, easy to replace the raw materials, no need to go to the inflatable station to inflate. 1.5mm thickened wall cylinder, two size options 2.5L/4L. 2.5L capacity supporting maximum reaction materials (400g citric acid + 400g baking soda + 600ml water). 4L capacity supporting maximum reaction materials (800g citric acid + 800g baking soda + 1200ml water). Longer life than other similar cylinders.
• Corrosion and high pressure resistant 304 stainless steel cylinder with a pressure load of 80kg/cm² (1137 psi). Safer to use. The CO2 regulator is also made of 304 stainless steel, anti-corrosion. (Other regulators on the market are basically aluminum alloy, which is low cost but easily corroded.) Equipped with a safety valve that automatically relieves the pressure when the pressure exceeds the safety value.
• The bubble counter is integrated with the solenoid valve and has a built-in check valve. And the solenoid bubble counter is replaceable. 12V DC mini solenoid valve! Waterproof, cool touch, super quiet, no humming noises and energy saving.
• This complete DIY CO2 Kit provides an excellent method of deploying the citric acid / baking soda solution to generate CO2 for plants' growing in the aquarium. This set contains almost all the necessary accessories, only the reaction raw materials need to be prepared by yourself.
• Quality inspection one by one, rather than random inspection! We are serious about quality control and buyer experience! If there are any questions, suggestions or ideas, please feel free to contact us.

• 2.5L size Max material at a time: 400g citric acid + 400g sodium bicarbonate +600ml water.
• 4.0L size Max material at a time: 800g citric acid + 800g sodium bicarbonate +1200ml water.
• The temperature will be low during the material interaction. So it will be normal when there's mist around the bottle after put all the materials in it.
• Please do not place the bottle upside down or tilted.
• Material change steps: Make sure the pressure point at 0 → take the bubble counter and tube off → release the residual co2 → turn off and unplug the solenoid → unscrew the regulator → pour out the residue → clean the bottle with water → put new materials and water into it.

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