Christmas SaleToday's sale ends

Best Diy Co2 Aquarium - Holiday Sale

Advertising Disclosure

Last Updated - 16.12.2025

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

Show more
9.9

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.

Show more
Main highlights

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

ACAGALA

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

Show more
9.8

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.

Show more
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.

47,19 €
03

Yangers

Yangers Aquarium CO2 Bio-System Starter Kit, DIY Carbon Dioxide Generator Reactor Set Up for Water Plants Fish Tank, Set of Pipe Valve Gauge Bottle Cap with Needle Valve Pressure Gauge

Show more
9.7

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.

Show more
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 €
04

Generisch

Aquarium DIY CO2 Generator System Kit CO2 Generator System with Bubble Counter & Check Valve Carbon Dioxide Reactor Kit for Plants Aquarium

Show more
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.

Show more
Main highlights

Well sealed caps and tubes, leak-proof, not deformed, never loose.
Professional pressure gauge for pressure observation.
Made of stainless steel. It is strong, durable and efficient.
Equipped with a safety valve, the pressure is more than 4 kg, the pressure is automatically relieved, the pressure of the carbonated drink bottle is 8 kg, safety is guaranteed.
Cheap, easy to constantly produce pure CO2 through reactions.

17,42 €
Value for Money

05

Yosoo

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

Show more
9.5

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.

Show more
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

13,50 €
06

DONGKER

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

Show more
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.

Show more
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 €
07

Folpus

Folpus DIY CO2 System Aquarium Tank 8 Spiral CO2 Diffuser Glass Tube Bubble Counter + 2 Suction Cups

Show more
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.

Show more
Main highlights

The counter is 5 cm / 1.97 inches diameter, 15 cm / 5.91 inches long.
High quality
Compatible with pressurized CO2 tanks and DIY yeast bottles.
Bubbles moves up along the spiro, and when it escapes from the spiro, you can count bubbles per second.
Bubble counter that helps you estimate the amount of CO2 release into your aquarium.

12,69 €
08

Ausla

U-shaped CO2 Diffuser, DIY 4 in 1 Co2 Diffuser for DIY Co2 System, Check Valve, Bubble Counter, Planted Aquarium

Show more
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.

Show more
Main highlights

【】: Refund or resend if you have any problems
【Multifunctional】: These CO2 atomizers have a built-in multi-function system, including check valve, bubble counter, ultra micropore atomization and U-shaped air inlet. Suction cup is also included for mounting.
【Low cost】: this CO2 system is designed for economical use in planted tanks
【Easy to install】This diffuser is easy to attach. A suction cup for mounting is also included
【4 in 1 CO2 Diffuser】: 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

15,87 €
09

Karlak

CO2 Generator System Carbon Aquarium DIY CO2 Generator System CO2 Generator System with Bubble Counter and Check Valve Carbon Dioxide Reactor Kit for Plants Aquarium

Show more
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.

Show more
Main highlights

Professionelles Manometer für die Druckbeobachtung.
Günstig, einfach durch chemische Reaktionen ständig reines CO2 zu erzeugen.
Gut versiegelte Kappen und Rohre, auslaufsicher, nicht verformt, nie locker.
Ausgestattet mit einem Sicherheitsventil, der Druck beträgt mehr als 4 kg, der Druck wird automatisch entlastet, der Druck der kohlensäurehaltigen Getränkeflasche beträgt 8 kg, Sicherheit ist gewährleistet.
Aus Edelstahl. Es ist stark, langlebig und effizient.

41,28 €
10

Hsthe Sea

Hsthe Sea Aquarium CO2 System Kit DIY Aquarium Planting Tank CO2 System Pro Tube Valve Gauge Bottle Cap Kit

Show more
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.

Show more
Main highlights

This CO2 has a pressure gauge for pressure display, a gas adjustment function and a simple pressure, is easy to use, safe and practical. Start once, sustainable gas supply.
Made of metal material with a tube lock to ensure deformation and slip resistance when working. And with professional adjustment to ensure DIY.
Easy to use and designed for cost-effective use in planted tanks to provide your aquarium plants with a rich CO2 environment for better growth.
Bottle required: the bottle must be a carbonated beverage bottle. Do not use mushy bottles, bottles with green tea, mineral water, etc
Avoid adjusting the trim valve by sudden large or small movements. It cannot be suddenly turned up after it has been shut down immediately so as not to exert unusual pressure on the bottle.

20,99 €