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Best Co2 Systems - Holiday Sale

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Last Updated - 17.12.2025

Best Choice

01

FZONE

FZONE 2.5 L CO2 System Aquarium System Carbon Dioxide Reactor Kit with Regulator and Needle Valve for Aquarium Plants Tanks (with Solenoid

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9.8

Exceptional

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Safe. The bottle body is made of 1.5mm thick SUS304 stainless steel (25% thicker than normal 1.2mm bottles). It can withstand a pressure of up to 80 kg/cm2 (or 1137 PSI). The safety valve opens automatically when the internal pressure exceeds the safety threshold
Professional DIY kit. A complete system in a bottle with a size of 2.5 L, which includes a SUS304 stainless steel bottle, a regulator, a precision needle valve and an easily adjustable bubble counter
Please note: The required powders to generate CO2 gas are not included. You need citric acid and sodium bicarbonate powder
ONE YEAR WARRANTY Fzone offers a one-year warranty, 24/7 service and you can contact us at any time with any questions about our products.
Needle valve with bubble counter. The high-precision, aquarium-specific needle valve ensures accurate fine tuning. Steady 1 bps is achievable. Bubble counter with built-in check valve. It prevents water from flowing back into your CO2 tank (protects your CO2 tanks from rust and corrosion).
12 V DC instead of alternating current. When the magnet is on a timer, you can specify when and for how long the CO2 injection should be turned on

99,99 €
02

FZONE

FZONE CO2 Pressure Regulator Aquarium Co2 Regulator DC Magnet with Large Dual Gauge Display as well as Bubble Counter and Check Valve System Grow DIY CO2 System w21.8 - Side Open Cylinder

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9.6

Exceptional

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Updated split-type DC brine gap. Latest 12 DC split type solenoid instead of AC models, safer and more stable.
ONE YEAR WARRANTY Fzone offers a one-year warranty, 24/7 service and you can contact us at any time with any questions about our products.
HIGH PRECISION STRUCTURE CO2 pressure regulator is designed for aquarium. High precision fine tuning easy for CO2 to 1 bubble in 3 seconds. Improved sealing material prevents leakage.
Double large gauge. 1.6 inch double gauge, easy to read your cylinder internal and working pressure.
Class 1 manufacturing technology CO2 pressure regulator made of hard aluminium alloy, surface with spray treatment. Push button and fine adjustment knob with knurling.
Bubble counter and tool included. CO2 pressure regulator Together with the bubble counter, you can read your CO2 flow rate. Bubble counter with check valve function, stop water backflow to bottle. All installation tools included, make everything easy.

48,99 €
03

Umarex

Umarex 8 g CO2 capsule, pack of 10

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9.4

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Without thread – the cartridges have no thread, which makes them quick and easy to install and replace. Ideal for dynamic game situations.
Reliable performance - High pressure resistance enables reliable performance.
Filling - The capsules are each filled with 8 g CO2. The set contains 00 pieces.
Easy to use - The capsules are simply closed to develop their effect.
Compatibility – The CO2 capsules are suitable for all CO2 air guns, which are operated with 8 g cartridges.

16,40 €
Value for Money

04

ARKA

CO2 Refill Set - ARKA mySCAPE-CO2 Refiller 2 x 600 g - Component A: Citric Acid & B: Sodium - Suitable for CO2 Fertiliser Systems in the Aquarium - Easy to Dose, Economical & Safe - Aquascaping

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9.2

Excellent

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Universally compatible: ideal for ARKA mySCAPE systems - also suitable for many standard CO2 systems - particularly popular with DIY aquascaping - clear alternative to CO2 bottles & expensive cartridges.
Household friendly packaging: compact 2-chamber dosage - resealable & dry storage - many customers appreciate the high purity even for household purposes such as odour neutralisation or descaling.
Highly efficient and safe: one pack is enough for numerous CO2 cycles - cleanly dosed thanks to powder form - no gas cylinder required - suitable for beginners and professionals with refillable CO2 systems.
Efficient CO2 refill kit for freshwater aquariums - contains 600g citric acid & 600g baking soda - ideal for plant tanks with DIY or mySCAPE system - stable CO2 supply for optimal growth & vitality.
ARKA Quality from experience: developed for aquarists with demands - reliable CO2 supply at a fair price - 1000 times proven by plant lovers and DIY fans - part of the successful mySCAPE series.

9,90 €
05

fritz-cell

50 fritz-cell 12g Co2 Capsules for Airsoft Painball Air Guns or Air Rifles

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8.9

Very Good

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Main highlights

Type: 12 g
No thread
Length: 82.80 mm
Fits Gotach, Paintball, Air Rifle, Air Guns (Airguns)
Abdominal diameter: 18.70 mm, neck diameter: 7.35 mm

23,99 €
06

SodaTASTE

SodaTASTE Quick Classic CO2 cylinders, pack of 2 (spare cylinder) for water carbonators with quick connect system, for up to 120 litres of sparkling water

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8.8

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Unique and cost-saving: SodaTASTE combines bubble with taste in a single process. So you save not only time and money but also resources.
SUSTAINABLE PRODUCTION: Our packaging is made from 100% recycled material and supports the use of multiple shipping operations. In harmony with nature, we use biogenic CO2 to produce more sustainable products.
Natural taste as needed: Forget sugar and syrup. Choose from a variety of natural flavours to suit your taste. Also perfect for diabetics.
Certified quality and compatibility: our TÜV-tested and ISO certified aluminium cylinders are suitable for all standard water carbonators with screw system and made in Germany.
CLEVER EXCHANGE SYSTEM: Direct customer support and an intelligent exchange system ensure your complete satisfaction.

34,99 €
07

SodaTASTE

SodaTASTE Quick Classic CO2 Cylinders Replacement Pack of 2 (Refill) for Water Carbonators with Quick Connect System, for up to 120 L of Sparkled Water (Attention: Empty Cylinder Required)

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8.7

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

SUSTAINABLE PRODUCTION: Our packaging is made from 100% recycled material and supports the use of multiple shipping operations. In harmony with nature, we use biogenic CO2 to produce more sustainable products. In addition, our cylinders are 100% made in Germany
Refreshing: with the Classic CO2 cylinder from SodaTASTE you can transform tap water into sparkling water in no time at all. You can determine the intensity of the carbonic acid as desired.
Quick classic: this cylinder is suitable for carbonators with the Quick Connect system (e.g. for Duo, Terra, Art, Gaia & Crystal 3.0)
No empty CO2 cylinders at home? Then search for our "SodaTASTE CO2 purchase cylinder". Here you do not need to return anything and they allow you to order a replacement cylinder afterwards.
How it works: 1) We will send you your selection of exchange cylinders. 2) You take our full cylinders out of the box and put your empty cylinders in equal numbers. 3) Stick the included free return label on the box and send it back to us. 4) Done!
For purchase, you must already have the same number of empty cylinders at home (also possible foreign cylinders).
Economy pack: get an even better price in a practical double pack than when buying a single cylinder
Certified quality and compatibility: our TÜV-tested and ISO certified aluminium cylinders are suitable for all standard water carbonators with screw system and made in Germany.
21-day return: you have a full 3 weeks to return the empty cylinders (which are already in stock with you when purchasing). If you did not have a cylinder or have not returned, we will send you an invoice at the end of this deadline for the saved difference between exchange and purchase cylinder. These are flat rate for Classic cylinders €10.50 and for aroma cylinders 15€.

19,99 €
08

Umarex

Umarex Valve Maintenance Capsules for CO₂ Air Guns 0.5g

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8.6

Very Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

SPECIAL OIL FILLING: The valve maintenance capsules contain, in addition to CO₂ gas, 0.5 g of a special oil that cleans, lubricates the valve and provides an oil film to all sliding parts of the mechanism.
RELIABLE PERFORMANCE The maintenance capsules ensure reliable and smooth performance of your gun.
MAINTENANCE FRIENDLY: Lubricating and cleaning the valve and mechanism extends the life of the gun.
Easy to use: the capsules are simply closed to unfold their effect.
CONSTANT PRECISION Regular use of the maintenance capsule ensures constant precision and function of the weapon.

15,00 €
09

Generisch

Tropica Organic Plant Care CO2 System Organic
8.5

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.
Main highlights

24,79 €
10

Umarex

Umarex CO2 Capsules 12g - Pack of 10

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8.4

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

Without thread – the cartridges have no thread, which makes them quick and easy to install and replace. Ideal for dynamic game situations.
Reliable performance - High pressure resistance enables reliable performance.
Filling - The capsules are each filled with 12 g CO2. The set contains 10 pieces.
Easy to use - The capsules are simply closed to develop their effect.
Compatibility – The CO2 capsules are suitable for all CO2 air guns, which are operated with 12 g cartridges.

9,95 €