EHEIM pressurised CO2 kit for planted aquariums

Regular price $148.00
Regular price Sale price $148.00
$49.33 × 3 with no fees

This complete CO2 kit for planted aquariums comes in three sizes, for 200, 400 or 600 litres: the Set 200 comes with a disposable cylinder, the Set 400 and 600 with a refillable cylinder. Pressure regulator, diffuser, pipe and permanent test are supplied, and three versions include the solenoid valve that cuts off the gas at night.

Ref. H6063200·Aquarium CO2
Model : Set200
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The summary

  • What you receive: the cylinder of the version you choose, a precision pressure regulator, a safety diffuser, 3 m of pipe and a permanent test.
  • Which size: 200, 400 or 600 litres of aquarium, depending on the version you choose.
  • Disposable or reusable: the Set 200 comes with a disposable cylinder, the Set 400 and 600 with a reusable one.
  • The solenoid valve: it cuts off the gas at night, and three versions include it as standard.
  • The setting: it is made in bubbles per minute, using the diffuser's bubble counter and the permanent test.
  • Shipping: bulky parcel, shipped from France by Colissimo or Chronopost to your home.

Complete CO2 fertilisation kit, for 200 to 600 litres, with or without solenoid valve

The EHEIM pressurised CO2 kit for planted aquariums supplies the carbon dioxide that demanding plants cannot find in the water, for tanks of 200, 400 or 600 litres net volume. The Set 200 uses a disposable 500 g cylinder, the Set 400 and 600 a refillable cylinder. Three versions include a solenoid valve that shuts off the gas at night.

A densely planted aquarium uses more carbon than the water supplies, and this kit provides it in the form of dissolved gas. You receive the complete installation, with the cylinder, the pressure regulator, the pipe, the diffuser and what you need to measure the result. Three sizes cover tanks up to 200, 400 and 600 litres, and three versions include the solenoid valve that shuts off the gas at night. The setting is made in bubbles per minute, and it is read from the long-term test that stays in your tank. With a supply of CO2, you can grow more demanding plants and achieve faster growth, which leaves fewer nutrients available for algae.

🔧 Three kit sizes

The Set 200 works with a disposable 500 g bottle, which is recyclable and is replaced whole when empty. The Set 400 and Set 600 come with a refillable bottle, of 500 g on the Set 400 and 2,000 g on the Set 600, which you have refilled at a CO2 refilling station. Their pressure regulator has two gauges, whereas the Set 200's is adjusted by its fine-dosing valve alone. The diffuser also scales with size, as it is rated for up to 400 litres on the Set 200 and Set 400, and up to 600 litres on the Set 600.

The Set 200

This starter kit works with a disposable 500 g bottle and a diffuser rated for up to 400 litres, for an aquarium of 200 litres at most.

The Set 400

Its reusable 500 g bottle can be refilled, and its regulator carries two pressure gauges, for an aquarium of 400 litres at most.

The Set 600

The reusable bottle goes up to 2,000 g and the diffuser to 600 litres, for planted tanks of up to 600 litres.

Choose the size according to the real volume of your aquarium, with the decor deducted, rather than the gross volume of the tank. A 240-litre gross tank filled with rocks and sand often holds around 200 litres of water, and that is the figure that matters. Planting density then comes into play, since a heavily planted tank uses more CO2 for the same volume. Autonomy matters too: a larger cylinder makes no difference to the setting, but it means less frequent refills, which is helpful when the cylinder sits at the back of a hard-to-reach cabinet.

Tracking CO2 and pH together

The long-term CO2 test supplied stays in the tank and changes colour according to the CO2 level in the water, which tells you whether your setting in bubbles per minute is right. Complement it with a liquid pH test, since dissolved CO2 lowers this value, and measure the pH before commissioning and again after each change of setting. Finally, combine the installation with fast-growing plants, which are the ones that benefit most from a supply of carbon.

A pressurised cylinder is still a piece of gas equipment

Stand the cylinder upright, on its base or in its holder, away from heat, and never loosen the regulator when the cylinder is full. The supplied pipe is specific to CO2, because an ordinary air pipe lets the gas pass through its wall and empties the cylinder with no benefit to your plants. On the Set 200, a disposable spare cylinder screws in place of the empty one.

Plants only consume carbon in the light. The solenoid valve shuts off the gas flow when the lighting goes out and reopens it in the morning, which avoids sending CO2 into water that is not using it and whose pH would drop overnight. Three versions include it as standard: a version of the Set 400, a version of the Set 600, and a Set 600 supplied without a cylinder, for those who already own one with a standard fitting. It plugs into a programmable socket, for example the one for your lighting, and is also available as a separate accessory to equip a kit that does not have one at a later date.

🫧 Day-to-day adjustment

The diffuser's bubble counter gives the visual reference, and the non-return valve protects the regulator from water flowing back. You raise or lower the flow by a few bubbles per minute, then let the continuous test react before touching the setting again, because a CO2 installation takes several days to stabilise. The plants that benefit most are the fast-growing ones, and they also need light and nutrients, without which the added carbon does not turn into growth. Allow a week before judging a setting, and note down each change with its date, so you can get back to the value that gave the best result.

🔁 Run time and recharging

The lifespan of a cylinder depends on the flow rate set and the daily injection time, not on the volume of the tank. At the same flow rate, a 2,000 g cylinder lasts four times longer than a 500 g cylinder, and the solenoid valve extends this further by stopping injection overnight. CO2 is stored as a liquid in the cylinder, so its pressure stays roughly constant as long as liquid remains, then drops quickly: the bubble rate then falls without any warning sign. Note the start date of each cylinder to learn its real lifespan on your tank, and plan the next one before that point, because a tank used to CO2 reacts to an interruption of several days.

🌿 CO2 and aquaponics

On an aquaponics circuit, this equipment has no use, as it is designed for a planted ornamental aquarium. In a system that feeds crops, the balance depends on the pH and the nutrients supplied by the fish, and plants grown out of the water take their carbon from the air. Adding CO2 to the water would also lower the pH, whereas the nitrifying bacteria in the biofilter are most active in water close to neutral or slightly alkaline.

📦 What's in the box

Each kit includes a precision pressure regulator, a pipe fitting that swivels through 360 degrees, 3 m of CO2-resistant pipe in 4/6 mm diameter, a safety diffuser with bubble counter and non-return valve, a long-lasting CO2 test with its reagent liquid, and 5-in-1 water test strips. The cylinder is the one for the version you choose, with its stand on the Set 400, and the solenoid valve versions add the 230 V solenoid valve for overnight shut-off. Assembly needs no tools, so you can get started as soon as it arrives, once the cylinder is screwed onto the regulator.

Technical specifications

The essentials

Volumes covered
200, 400 or 600 LThree kit sizes, to be chosen according to the actual volume of the tank.
Bottle type
Disposable or reusableA 500 g disposable on the Set 200, a 500 g reusable on the Set 400 and a 2,000 g reusable on the Set 600.

What regulates the gas

Reducer
Precision pressure reducerPressure gauges on the Set 400 and 600, hose fitting that swivels through 360 degrees.
Diffuser
Up to 400 or 600 L600 L on the Set 600. Bubble counter and non-return valve built in.

What measures

Continuous testing
Long-term CO2 test and reagent
Test strips
5-in-1 water test

To budget for separately

pH monitoring
A drop-based pH testDissolved CO2 lowers the pH.
Programmable socket
To control the solenoid valveOn the versions that include it, set up in the same way as the lighting.

In the box

  • 1 precision pressure reducer
  • 1 pipe fitting that swivels through 360 degrees
  • 3 m of special CO2 pipe in 4/6 mm
  • 1 safety diffuser with bubble counter and non-return valve
  • 1 long-term CO2 test and its reagent liquid
  • 1 set of 5-in-1 water test strips
  • 1 bottle of 500 or 2,000 g and 1 solenoid valve, depending on the version chosen

Kit contents, bottle capacities and volumes covered were taken from the CO2 pages of the official EHEIM website on 20/09/2026 and checked on 08/10/2026.

Manufacturer and product safety

Manufacturer
EHEIM GmbH & Co. KG
Postal address
Plochinger Str. 54, 73779 Deizisau, Allemagne
Website
eheim.com

Information provided under Regulation (EU) 2023/988 on general product safety.

Three ways to add carbon to a planted tank

A bottle to pour in every day, a tank that ferments, or a pressurised cylinder: the choice depends on the space you have and on what you are willing to do every day.

An empty cabinet calls for a different solution from a cluttered shelf Carbon can be supplied in three ways, and the space available is what rules out one of the three first.

What supplies the carbonNo equipment to installDosing frequencyEquipment to place under the tankWorks without a pressurised bottleSeveral capacities in the catalogueConsumable to replacePrice
Easy-Life EasyCarbo liquid carbon forYour choiceA liquid to pour inYesEvery dayNoYesYesA new bottle$7.00
JBL ProFlora Advanced fermentation CO2Your choiceFermentation in a tankNoOne charge every 40 daysYesYesNoThe bio-components$68.00
Recommended
EHEIM pressurised CO2 kit for plantedYour choice		A pressurised bottleNoContinuous adjustment at the regulatorYesNoYesA CO2 cylinder$148.00
Easy-Life EasyCarbo liquid carbon for
The principle
What supplies the carbonA liquid to pour in
No equipment to installYes
The action
Dosing frequencyEvery day
Equipment to place under the tankNo
The installation
Works without a pressurised bottleYes
Several capacities in the catalogueYes
In the shop
Consumable to replaceA new bottle
JBL ProFlora Advanced fermentation CO2
The principle
What supplies the carbonFermentation in a tank
No equipment to installNo
The action
Dosing frequencyOne charge every 40 days
Equipment to place under the tankYes
The installation
Works without a pressurised bottleYes
Several capacities in the catalogueNo
In the shop
Consumable to replaceThe bio-components
EHEIM pressurised CO2 kit for plantedRecommended
The principle
What supplies the carbonA pressurised bottle
No equipment to installNo
The action
Dosing frequencyContinuous adjustment at the regulator
Equipment to place under the tankYes
The installation
Works without a pressurised bottleNo
Several capacities in the catalogueYes
In the shop
Consumable to replaceA CO2 cylinder

Dosing intervals, volumes covered and contents noted on 20/09/2026 from the official Easy-Life, JBL and EHEIM pages.

Estimate your
delivery time

Bulky parcel dispatched within 48 hours from France, by Colissimo or Chronopost home delivery. The exact charges and delivery times are shown in the basket once you have entered your address. Outside the European Union, import duties and taxes are payable by the recipient.

Frequently asked questions

10 questions

6 key questions, 10 in the detailed view

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