Description
GLA GRO Cartridge CO2 Kit
The GLA GRO Cartridge CO2 Kit is a compact, cartridge-based CO2 system designed for nano and small planted aquariums where space, simplicity, and clean installation are priorities. Using a 74g disposable CO2 cartridge, the system provides pressurized CO2 control without requiring a full-size cylinder installation.
Built around the GLA GRO regulator platform, the kit combines precise CO2 adjustment, automatic operation, integrated flow monitoring, and a heavy-duty aluminum cartridge base in a compact configuration. An included CGA-320 adapter also allows the regulator to be used with standard USA refillable CO2 cylinders, providing additional flexibility as aquarium needs change.
At a Glance
- Pressure Regulation: Piston-type mechanism with integrated pressure regulation for consistent, stable output pressure
- Primary CO2 Source: 74g disposable CO2 cartridge
- Refillable Cylinder Compatibility: CGA-320 standard USA CO2 cylinders using the included adapter
- Pressure Monitoring: Integrated working-pressure gauge
- Output Pressure Range: 0–70 PSI
- Standard Configuration: Single aquarium
- Automation: Integrated electric solenoid
- Warranty: GLA Limited Lifetime Warranty on the regulator
Best For
- Nano and small planted aquarium installations
- Desktop aquariums and minimalist aquascapes
- Installations where a full-size CO2 cylinder is impractical or undesirable
- Aquarists seeking a compact pressurized CO2 system
- Hobbyists who want the option to transition to a standard refillable CO2 cylinder later
- Beginner and experienced aquarists who prioritize simplicity and clean installation
The cartridge configuration is particularly well suited for aquariums with lower CO2 consumption. For larger or higher-demand systems, the included CGA-320 adapter allows the regulator to be transferred to a standard refillable CO2 cylinder.
Why Choose the GLA GRO Cartridge Kit?
The GRO Cartridge Kit combines the compact convenience of disposable CO2 cartridges with the precision components and control features of a full pressurized aquarium CO2 regulator.
- Compact Cartridge Configuration: Provides pressurized CO2 without requiring a large cylinder
- 74g Cartridge Capacity: Larger cartridge format provides greater capacity than many smaller disposable cartridge systems
- Precision CO2 Adjustment: Fine-control needle valve allows careful tuning of CO2 output
- Automatic Operation: Integrated solenoid allows CO2 injection to be controlled by a timer or compatible controller
- Integrated Flow Monitoring: Bubble counter provides a convenient visual reference for CO2 delivery
- Backflow Protection: Integrated check valve helps protect the CO2 system from aquarium water backflow
- Heavy-Duty Aluminum Base: Provides a stable platform for the cartridge installation
- CGA-320 Versatility: Included adapter allows the regulator to be installed on standard USA refillable CO2 cylinders
Precision Control & Automation
The GRO Cartridge regulator combines a precision needle valve, electric solenoid, integrated working-pressure gauge, and bubble counter into a compact assembly designed specifically for planted aquarium CO2 use.
The needle valve provides fine adjustment of CO2 flow, while the solenoid allows injection to be automatically coordinated with the aquarium photoperiod using a timer or compatible controller. The integrated working-pressure gauge provides a clear visual reference for regulator output pressure, and the bubble counter provides a convenient repeatable reference when tuning the system.
Bubble rate should be treated as an aquarium-specific reference rather than a universal CO2 measurement. Actual CO2 requirements vary with aquarium volume, plant mass, lighting, circulation, diffusion efficiency, and surface agitation.
Cartridge Convenience with CGA-320 Flexibility
The GRO Cartridge Kit is designed primarily around the compact 74g disposable cartridge configuration, making it especially convenient for nano aquariums, desktop installations, and locations where a larger CO2 cylinder may not be practical.
Unlike a cartridge-only regulator, the included CGA-320 adapter allows the GRO regulator to be installed on standard USA refillable CO2 cylinders. This provides a clear upgrade path if CO2 demand increases or if the regulator is later moved to a larger aquarium installation.
- Use the included 74g disposable CO2 cartridge for compact installations
- Transition to a standard refillable CO2 cylinder using the included CGA-320 adapter
- Continue using the same GRO regulator when changing CO2 source
- Choose the cylinder configuration that best fits the aquarium and available installation space
Engineering & Performance
- Laser-Precision Metal-on-Metal Valve Seat: Engineered for consistent regulation and long-term operation
- Multi-Stage Micron Filtration: Helps protect internal pneumatic components
- Precision Needle Valve: Provides fine CO2 flow adjustment
- Integrated Working-Pressure Gauge: Provides a visual reference for regulator output pressure
- Integrated Electric Solenoid: Enables automatic CO2 operation
- Integrated Bubble Counter & Check Valve: Provides flow monitoring and backflow protection
- Durable Aluminum Regulator Body: Compact construction designed for planted aquarium use
- Heavy-Duty Aluminum Cartridge Base: Provides stability for the cartridge configuration
- USA Inspection & Testing: Each regulator is pressure tested and leak checked prior to shipment
Specifications
- Primary Installation: 74g disposable CO2 cartridge
- Alternate Installation: CGA-320 standard USA refillable CO2 cylinder using the included adapter
- Pressure Reduction: Piston-type mechanism with integrated pressure regulation for consistent, stable output pressure
- Pressure Monitoring: Integrated working-pressure gauge
- Output Pressure Range: 0–70 PSI
- CO2 Distribution: Single aquarium
What’s Included
- GLA GRO Cartridge CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision needle valve
- Integrated bubble counter with check valve
- 74g disposable CO2 cartridge
- Heavy-duty solid aluminum cartridge base
- CGA-320 adapter for installation on standard USA refillable CO2 cylinders
Please Note: CO2-resistant tubing and a compatible diffuser, atomizer, or reactor are required to complete the CO2 installation and are sold separately.
Frequently Asked Questions
How long does a 74g CO2 cartridge last?
Cartridge lifespan varies significantly depending on aquarium size, CO2 injection rate, photoperiod, diffusion efficiency, and overall CO2 demand. Nano and smaller planted aquariums generally consume less CO2, which is why the cartridge configuration is best suited for these installations.
Can the GRO Cartridge Kit be used on a larger aquarium?
Yes. The cartridge configuration is designed primarily for nano and small planted aquariums, but the regulator itself is not limited to the 74g cartridge. The included CGA-320 adapter allows the regulator to be installed on a standard USA refillable CO2 cylinder for greater capacity and versatility. For larger or higher-demand systems, a full-size cylinder or another GLA regulator platform may be the more practical configuration.
Can I switch from cartridges to a refillable CO2 cylinder later?
Yes. The included CGA-320 adapter allows the GRO regulator to be transferred from the 74g cartridge configuration to a standard USA refillable CO2 cylinder without replacing the regulator.
Do I need anything else to use the kit?
Yes. CO2-resistant tubing and a compatible diffuser, atomizer, or reactor are required to deliver CO2 into the aquarium and are sold separately.
Can I use a diffuser, inline atomizer, or CO2 reactor?
Yes. The adjustable 0–70 PSI output allows the regulator to be configured with many planted aquarium CO2 delivery methods when operated within the pressure and flow requirements of the selected equipment.
Is the GRO Cartridge Kit suitable for beginners?
Yes. The compact cartridge configuration provides a straightforward introduction to pressurized planted aquarium CO2 while retaining precise adjustment, automatic solenoid control, integrated pressure monitoring, and the component quality expected from GLA equipment.
CO2 Cartridge Refills
Replacement 74g CO2 cartridges are available separately, making it easy to replace the cartridge when depleted and return the system to operation.
View 74g CO2 Cartridge Refills
Choosing the Right GLA CO2 Platform
The GRO Cartridge Kit is our compact cartridge-based platform for nano and space-conscious planted aquarium installations, with the added flexibility of CGA-320 refillable cylinder compatibility. The standard GLA GRO provides a streamlined CGA-320 piston platform, the DS-Mini combines compact dual-stage pressure regulation with modular expansion, and the PRO-DS is our full-size dual-stage platform with expanded pressure range, dual-gauge instrumentation, and modular configuration options.
Each platform is designed for a different installation style, CO2 source, and level of system flexibility.
Compare GLA CO2 Regulators & Systems
GLA CO2 Equipment
Green Leaf Aquariums specializes in planted aquarium CO2 equipment engineered around precision, reliability, and long-term performance. GLA regulator systems are built specifically for the demands of nature aquariums and high-tech planted aquarium environments.
Each GLA regulator is individually inspected and tested in the USA prior to shipment to help ensure dependable operation and consistent performance.
Support & Warranty
Return Policy: Due to the technical nature of pressurized aquarium CO2 equipment, this item is non-returnable and non-refundable. Qualifying defects remain covered under the GLA Limited Lifetime Warranty and are handled separately through warranty support. Please contact GLA prior to ordering if you need assistance with product selection, installation, or compatibility.
- Limited Lifetime Warranty: Regulator covered against qualifying defects in materials and workmanship
- Lifetime Support: Expert assistance available
- Installation Guidance: We’re here to help you get started
Limited Lifetime Warranty: GLA CO2 regulators are covered by a limited lifetime warranty against defects in materials and workmanship for the original purchaser. This warranty is non-transferable and applies only when the product is used in accordance with Green Leaf Aquariums, LLC (GLA) guidelines and standard operating practices.
Warranty coverage applies only to products purchased directly from greenleafaquariums.com or authorized sales channels. Proof of purchase is required for warranty claims.
This warranty does not guarantee product performance for the lifetime of the purchaser. Product lifespan may vary based on usage, installation, maintenance, and operating conditions.
- Coverage applies only to manufacturing defects under normal use
- GLA reserves the right to repair, replace, or issue store credit at its sole discretion
- If a product is discontinued, a comparable replacement or credit may be provided based on product condition and age
Warranty Exclusions:
- Improper installation, misuse, neglect, or accidental damage
- Use of improper tools, fittings, or excessive force
- Modifications, alterations, or unauthorized repairs
- Damage caused by contamination, corrosion, or improper gas supply
- Normal wear, cosmetic wear, or external damage that does not affect normal functionality
Important: Always follow the installation instructions for the specific CO2 cylinder or cartridge configuration being used. Damage resulting from improper installation, improper use of tools, excessive force, or incorrect assembly is not covered under this warranty.
GLA is not responsible for damage caused by improper installation or use. However, repair services and support may be available for a fee.
CO2 cylinders, tubing, cartridges, and other consumable or accessory items are not covered under the regulator warranty unless otherwise specified.
For complete warranty coverage, exclusions, claim requirements, and terms, please review our Shipping, Returns & Warranty Policy.
Customer Reviews
-
GRO nano CO2 kit
It is a compact unit. The needle valve is very good to control bubble rate. Will definitely recommend this unit.
-
Great for All Sizes of Planted Tanks
Avery well made product, easy to install and use, the needle valve can be adjusted to very low levels and keep the co2 injection very stable. Perfect for planted nano tanks. In addition to all this they included a cga320 adapter to connect it to a larger co2 tank (for free) and use it in bigger planted tanks…. what else could you ask for?
-
Awesome!
Loving this nano kit. Next year I will get the adapter to use on a bigger tank and cylinder. Very slick and extremely well made.
-
Perfect mini regulator for micro tanks
I have these on my 3 and 9 gallon tanks and they're the perfect kit for their size
-
First CO2 Regulator
This is my first CO2 system after years in the hobby, and it was a great little all-in-one kit. Everything I needed to get started, minus the diffuser, which is more tank-specific. I really recommend giving it a shot!
-
A+++ Co2 kit!
Very nice well made co2 regulator. I love that when Im ready this joker fits a full sized cylinder. Its super smooth operation has me very satisfied.
-
Love it!
Very happy, love that I can use this on a bigger tank in the future. GLA was superb!
-
Perfect for any size aquarium.
Im loving this nano co2 system from GLA. The entire installation process require zero tools. Co2 was up and running in a few minutes. Everything has been purring like a kitten for weeks now on one bottle so far. I was expecting to change by now. This is on a 10G nano tank so my bubble rate is relatively low. Speaking of which, the needle valve is like that of my Ideal metering valve on my older GLA regulator from 13 years ago thats also still going strong. If you dont know what metering valves are, these are very expensive needle valve that typically cost more than this entire system itself. The needle valve is the black tubing knob that the bubble counter connects to, and its just amazing for its size. I emailed and spoke to GLA. What they did was very clever. Because they work with needle valves for decades, they knew what had to be done here. They copied the flow curve of an Ideal metering valve. This compact small needle valve has a flow coefficient like nothing in its class. A normal metering valve is about 4-5" long. GLA achieved this in 1" of length. This is amazing and even better they did it with all metal internals. This is a very nice kit for what you are paying and you get GLA support. You dont get any better than that.
-
Very cool co2 system from GLA.
Really cool kit GLA put together. I do not have room in my apartment yet but in a few months I will be going to a 5lb cylinder. This regulator only requires an adapter to fit full sized cylinders. Its the same exact Gro regulator you see on the systems page. Its a very sturdy build with very well made components through and through. I like GLA's warranty and the help they have provided. These guys are great.
-
GLA nano kit is very nicely made.
Very happy, espcerailly the price. Once you get it at home you will see its well worth it. These days I would expect to pay much more but this little system has been terrific. Ive used 3 cylinders in the last 7 months! I did not to get that much use out of one cylinder. Whats really cool is how low you can adjust the bubble rate. You can get it so low its not even normal to see low bubble rates that low. Im not even sure who would need that but cool to know I have that ability, because its a super fine tuned needle valve.
-
Sweet nano co2 kit.
This kits is pretty cool, no complaints other than you ned to buy a diffuser but I understand. Its simple to set up in minutes. Whats cool is you can use this same kit on larger cylinders in the future. All they said was to buy the GLA adapter and your ok to go. Very effective and my bubble counter is always steady. I use mineral oil in my bubble counter to ovoid having to refill often.
-
Very cool little kit, that does so much more.
I could not for the life of me find a place to fill my 5lb in my new town. Luckily I did find a place that was advertising but they are not yet open for another 4 months on the new place. GLA assured me this would work later on a full sized provided I get the extra adapter. This bad boy works terrific and we are super happy.
-
Its perfect for my dorm room!
I dont think Im technically allowed to have this in my dorm room first year of collage. Whats great about this is it hides super easily. Full on pressurized co2 into a small compact package. This was perfect!
-
Pro grade mini co2 system.
Much nicer than my Tropica mini co2 system. This one has a complete solenoid system built into the body. You can plug into any outlet of basic timer, I opted for the Bluetooth timer for basic on/off automation. So neat, I can control my co2 from my phone in terms of being on/off. You will need some tubing and a diffuser. They dont include one but thats understandable as there are so many sizes. It sits on my kitchen counter and I get to watch it all day!
-
Gro kit
I am still mind blown by the quality of this little regulator, and for the money you get all the goodies to make it a kit too. The solenoid is really nice for keeping that hands free operation once dialed in as well. The bubble counter and needle valve are by far the smoothest I've felt. So add on a diffuser and check valve of choice and your good to go!
-
Excellent Nano co2 kit.
I love this nano co2 system. Its been perfect for my desktop. I added the acrylic diffuser and soft tubing to the kit and its been rock solid. I learned later that this regulator also works with paintball and standard 5lb co2 cylinders. 3 in 1!
-
Excellent system for nano tank
Prior to purchasing this system I was using a basic starter kit (Fluval 45g kit) for my 3 gallon. This system, especially due to the solenoid and separate valves has allowed for much better precision and daily fiddling to get the bubble count right. The flow is consistent and it's a set of and forget it system which has made things so much easier. My plants are loving it.
-
Great Service & Great Products!
Sent an inquiry thru the website abt this & got an immediate response. Been out of the hobby awhile & my q?s weren’t dismissed. Thank u. As for the CO2 system— the value is hard to beat, the solenoid alone pays for Itself. The whole unit works wonderfully & there r very detailed instructions included. All you need is CO2 Tubing, a Check Valve & a Diffuser & you’re all set! I bought the replacement CO2 cartridges but an adapter they sell here can make it fit onto larger tanks /if preferred.
-
Absolutely perfect
You will not find a better nano co2 kit on the planet. This is the best Nano co2 kit I have found anywhere. Not even ADA kit can compare to this in price,form and function. When this arrived I was truly blown away at its build quality. Its heavy duty and means business. The guys at GLA have been doing co2 systems since 2006, they know what they are doing. This nano kit comes totally complete and has been working flawless in my 5.5g nano tank for a few months now without issue. The only thing I have to do is refill the bubble counter. Which by the way, you have the option to run an inline bubble counter. You dont have to use the supplied co2 bubble counter. You can attach tubing directly to the needle valve, it comes ready to go. Look no further, this is THE nano co2 kit.
-
Co2 cartridge regulator
Dipping my toes into trying CO2 for planted tank, and ordered the co2 cartridge set-up to try out in a nano. Regulator solid, shiny :) and easy to adjust, and holds its count even at quite low rate. Arrived quickly, well packaged, with good instructions. All good with me, coming back in a few months for my next regulator investment.
