Best Diy Co2 Aquarium 2025

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Last Updated - 26.07.2025

Best Choice

01

ACAGALA

ACAGALA Aquarium DIY CO2 Generator System Kit CO2 Generator System with Solenoid Valve Bubble Diffuser Carbon Dioxide Reactor Kit for Plants Aquarium

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9.9

Exceptional

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Main highlights

The safety valve supports manual pressure relief. If the pressure is below 4 kg, it can be relieved manually by pulling the ring of the safety valve. It is very safe.
Solenoid valve: turn on and off the CO2 generator system with a timer (not included). Bubble counter with check valve: flow rate of the CO2 gas indicator and prevent the backflow of water into the bottle.
Made of aluminium alloy. It is strong, durable and efficient. Well sealed caps and tubes, leak-proof, not deformed, never loose. Professional pressure gauge for pressure monitoring. Cheap, easy to constantly produce pure CO2 through chemical reactions.
Equipped with a safety valve, the pressure greater than 4 kg pressure is automatically relieved, the pressure of the carbonated drink bottle is 8 kg, safety is guaranteed.
Comes with a bubble diffuser, refine the bubbles and make it easy to dissolve in water and be absorbed by plants. Inject CO2 into your aquarium quickly and easily.

47,69 €
02

DONGKER

DONGKER DIY CO2 Generator System Kit, Aquarium Carbon Dioxide Reactor Kit with Pressure Gauge for Aquariums, Aquatic Plants

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9.8

Exceptional

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Main highlights

Precision pressure gauge: the pressure inside the bottle is clearly visible. A special pressure gauge with indication of the safety zone and scale. It is convenient to clearly observe the pressure of the starting response and improve the starter success rate. Overpressure protection, once the pressure exceeds the maximum value, the safety valve automatically releases excess pressure until a safety value is reached.
Easy to install and use: a good choice to make your aquarium different. Simple and cost-effective create CO2 Puro constantly through chemical reactions simply with the airflow adjustable to the volume of CO2 valve. Note: Please check the alignment of the parts before installation. Incorrect assembly leads to abnormal reaction components.
DURABLE The hose has strong pressure resistance, the hose between the two caps is acid and hydrolysis resistant. Bottle cap made of ABS plastic, professional and sturdy structural design to ensure that it is not deformed, wear-resistant and anti-aging.
DIY CO2 generator system: the CO2 content of the water is lower and the growth of aquatic plants is slow. Therefore, it is necessary to manually add CO2 to water plants for absorption. Design a CO2 supply system to help your aquarium plants breathe, which is essential for your plants.
Carbon Dioxide Generator: CO2 DIY kit for cost-effective production of CO2 for the growth of aquarium plants using citric acid/baking soda solution as raw material. (The raw material for the CO2 generator is not included.)

26,99 €
03

Garosa

Garosa CO2 Aquarium Plant System, CO2 Generator System Kit with Pressure Gauge, CO2 System Pro Pipe Valve, Pressure Gauge, Bottle Cap Kit

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9.7

Exceptional

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Main highlights

★CO2 Generator System: This CO2 generator line provides a real environment for plant growth in the aquarium. It provides your aquarium plants with a rich CO2 environment for better growth, is easy to use and designed for the cost-effective use of plant tanks.
★ With pressure gauge: this CO2 generator system kit with pressure gauge for pressure display, pressure range 0-6 kg/cm2. Safety DIY, after the pressure has exceeded the safety value, the safety valve is extended and the automatic pressure relief is opened. After reaching the safety value, the original shape is retained to maintain air tightness.
★ What do you need to prepare for these systems in addition (not included): 2 x 2 litre Coka Cola plastic bottle, 1 x 200g citric acid or 200ml vinegar, 1 x 200g baking soda. Slide the acidic liquid into the small soda liquid, with the two liquids reacting and producing continuous CO2.
★ Tips for installation: the bottle must be a carbonated drink bottle, must not use porridge, green tea, mineral water bottles, etc. so as not to exert abnormal pressure on the bottle.
★ Note: Before assembling, pay attention to the direction of the parts. The usual incorrect grip results in abnormal reaction components as follows: the opposite direction of the check valve and fine tuning in the direct direction.

19,30 €
04

Yangers

Yangers Aquarium CO2 System Kit, DIY CO2 Generator for Water Plants, Fish Tank, Set of Pipe Valve Gauge, Bottle Cap with Needle Valve, Pressure Gauge

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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

The raw material for generating CO2 is not included.
Robust design: built-in check valve, bubble counting function. Reduce the generation of large bubbles and increase the refinement area, making the contact area of CO2 and water larger. It is easier to dissolve in water for photosynthesis.
Note: Please carefully check the alignment of the parts before installation. Incorrect assembly will result in abnormal reaction components.
Digital pressure gauge: easy to read pressure gauge display, pressure range 0-6kg/cm². Overpressure protection, as soon as the pressure exceeds the maximum value, the safety valve automatically releases excess pressure until a safety value is reached.
DIY CO2 generator system: design a CO2 supply system to breathe your aquarium plants, which is essential for the growth of your plants.

20,99 €
Value for Money

05

Tiardey

Tiardey 2pcs Aquarium CO2 Generator Carbon Dioxide Reactor Aquarium DIY Quick Twist Bottle Cap Air Diffuser Generator Part

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9.5

Excellent

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Main highlights

Use one side for the air pump and the other side to put the salt shrimp in a container.
The specification of the air tube that can be connected to the joint is 4 mm inner diameter and 6 mm outer diameter.
Reactor bottle stopper for use on any soda/water bottle for a kind of shrimp brood.
Easy to install and suitable for all kinds of DIY reactors.
Can add or control the amount of CO2 available to your fish and plants, and add essential CO2 to your aquarium water.

6,99 €
06

Estink

Estink CO2 Diffuser, DIY 4 in 1 CO2 Drop Checker with Check Valve, Bubble Counter, Ultra Micropore Atomization and U-shaped Air Inlet for Aquarium

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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

【】: refund or resend if any problem
【Simple】: Suction cup is also included
【Multifunctional】: this CO2 atomizer with built-in multi-function system, including check valve, counter, bubble, ultra micropore atomization and U-shaped air intake
【Low cost】: this CO2 system is designed for cost-effective use in planted tanks
【4 in 1】: It is a 4 in 1 high performance CO2 diffuser for DIY CO2 systems (1-2 bar) and compressed CO2 for up to 300L aquarium

7,78 €
07

Yosoo

DIY CO2 Carbon Dioxide Generator Aquarium Plant System Kit D201 Tube Valve Guage Bottle Cap

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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

With pressure gauge: DIY aquarium aquarium plants has a pressure range of 0-6 kg/cm2. When the pressure exceeds a safe value, the safety valve expands and the pressure is automatically reduced.
Recommended reaction materials: vinegar + sodium bicarbonate + lemon/alum + yeast powder, baking soda, etc. Die Flasche muss eine kohlens?urehaltige Getr?nkeflasche sein.
Preparation: 2 x 2 litre plastic bottles, 1 x 200 g lemon or 200 ml vinegar, 1 x 200 g baking soda. Slide the acidic liquid into the baking soda, where the two liquids react and continuously produce CO2.
High efficiency: each outlet port of the CO2 system kit has 180 ultra-small holes of 100 microns that can produce 500,000 bubbles per minute. Oxygen absorption: 3L/min
DIY CO2 System:Provide a high carbon dioxide environment for your aquarium plants and a real environment to help them grow better.

23,19 €
08

Ausla

Ausla DIY CO2 Generator System Kit, Professional DIY CO2 Generator Aquarium Plant System Kit, DIY Aquarium Planted Tank CO2 System for Aquarium Moss Plants

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9.1

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

[Versatile Compatibility] - Works with 2 litre plastic bottles and various acidic and alkaline substances such as citric acid, vinegar, baking soda and more.
[PRECISE CONTROLING] - The trim valve allows easy regulation of CO2 flow, ensuring stable and efficient CO2 production while avoiding abnormal pressure on the bottle.
[Economical and Practical] - This DIY CO2 system is cost-effective and easy to use, providing a CO2 environment for better growth and health of your aquarium plants.
[Easy to Setup] - This DIY CO2 system is designed for cost-effective use in planted plants and provides a real environment for the growth of your aquarium plants.
[Continuous CO2 Production] - This CO2 generator utilizes an irreversible chemical reaction of strong acid and strong base and continuously generates carbon dioxide so your plants can photosynthesize and thrive.

20,23 €
09

CAPS

CAPS DIY Aquarium Co2 System Generator Kit with Pipes Tool Part Bottle Cap for Planted Aquarium Accessories

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9.0

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

The CO2 system is designed for cost-effective use in planted tanks
Fish: aquarium CO2 system generator
CO2: Aquarium
CO2 diffuser: Aquarium CO2
CO2 Aquarium: CO2 Regulator

4,78 €
10

Yosoo

Yosoo U-shaped DIY of 4 in 1 Co2 diffuser for DIY Co2 system check valve bubble counter planted Aquarium

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8.9

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

[Easy to install] The diffuser is easy to install.
With suction cup: suction cup is also included for mounting
High capacity: it is a 4-in-1 high-performance CO2 diffuser for DIY CO2 system (1-2 bar) and compressed CO2 for up to 300 L aquarium
Fully functional: this Co2 atomiser with multi-functional all-in-one, including check valve, counter, bubble, ultramicropore atomisation and U-shape air inlet
Cost-effective design: CO2 system is designed for low cost planted tank use

14,93 €