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A pressurized CO₂ kit for an aquarium (with cylinder + regulator) generally consists of the following elements:
Main components
CO₂ Cylinder
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This is the CO₂ “reserve”, usually made of steel or aluminum, under high pressure (often around 50–70 bar depending on temperature).
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It can be “disposable” (single-use) or refillable. Some kits use certified refillable cylinders.
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You must check the thread type / connector of the cylinder to ensure compatibility with the regulator.
Regulator
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Used to reduce the high pressure of the cylinder to a lower “working pressure” suitable for the aquarium (for example around 1.5 bar for some regulators).
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Often equipped with two pressure gauges: one shows the pressure in the cylinder, the other the output pressure (working pressure).
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An adjustment screw (needle valve) allows precise control of the CO₂ flow (bubble count).
CO₂ Tubing
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Connects the regulator to the diffuser (or another dissolution system) in the aquarium.
Bubble Counter
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Allows visual monitoring of the CO₂ “flow”: you count the number of bubbles per second/minute to set the dosage.
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Very useful for fine-tuning and calibrating the injection.
CO₂ Diffuser (or atomizer)
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Placed inside the aquarium: it turns the CO₂ into micro-bubbles so it dissolves into the water.
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Several types exist: ceramic, glass, reactor, U-tube… depending on tank size and desired diffusion efficiency.
Planted Aquarium CO₂ Kit
A pressurized CO₂ kit for an aquarium (with cylinder + regulator) generally consists of the following elements:
Main components
CO₂ Cylinder
-
This is the CO₂ “reserve”, usually made of steel or aluminum, under high pressure (often around 50–70 bar depending on temperature).
-
It can be “disposable” (single-use) or refillable. Some kits use certified refillable cylinders.
-
You must check the thread type / connector of the cylinder to ensure compatibility with the regulator.
Regulator
-
Used to reduce the high pressure of the cylinder to a lower “working pressure” suitable for the aquarium (for example around 1.5 bar for some regulators).
-
Often equipped with two pressure gauges: one shows the pressure in the cylinder, the other the output pressure (working pressure).
-
An adjustment screw (needle valve) allows precise control of the CO₂ flow (bubble count).
CO₂ Tubing
-
Connects the regulator to the diffuser (or another dissolution system) in the aquarium.
Bubble Counter
-
Allows visual monitoring of the CO₂ “flow”: you count the number of bubbles per second/minute to set the dosage.
-
Very useful for fine-tuning and calibrating the injection.
CO₂ Diffuser (or atomizer)
-
Placed inside the aquarium: it turns the CO₂ into micro-bubbles so it dissolves into the water.
-
Several types exist: ceramic, glass, reactor, U-tube… depending on tank size and desired diffusion efficiency.
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Tax included
Operation
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The regulator is attached to the cylinder (with the appropriate connector).
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The cylinder is opened, and the high pressure is then “reduced” by the regulator to a lower working pressure.
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The output pressure is adjusted using the regulator’s adjustment screw.
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Using the fine valve / needle valve, the flow rate is set (number of bubbles in the bubble counter).
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The tubing carries the CO₂ to the diffuser, which injects it into the aquarium.
