Description
GLA GRO Planted Aquarium CO2 System
The GLA GRO CO2 System provides a streamlined foundation for pressurized CO2 injection in planted aquariums. Built around the GLA GRO regulator platform, the system combines precision CO2 control, automatic operation, a refillable aluminum CO2 cylinder, and CO2-resistant tubing in one coordinated package.
Designed for clean installation and dependable long-term operation, the GRO System is an excellent choice for aquarists who want the essential pressurized CO2 components without the additional size or modular architecture of a dual-stage system. Each GLA GRO regulator is individually inspected, pressure tested, and leak checked in the USA prior to shipment.
At a Glance
- Pressure Regulation: Piston-type mechanism with integrated pressure regulation for consistent, stable output pressure
- Cylinder Connection: CGA-320 standard USA CO2 cylinders
- Included Cylinder: 5 lb aluminum CO2 cylinder; one- or two-cylinder package selectable at purchase
- Pressure Monitoring: Integrated working-pressure gauge
- Output Pressure Range: 0–70 PSI
- Standard Configuration: Single aquarium
- Expansion: Compatible with the optional GLA GRO CO2 Splitter
- Automation: Integrated electric solenoid
- Tubing: 10 feet of CO2-resistant aquarium tubing
- Warranty: GLA Limited Lifetime Warranty on the regulator
Best For
- Aquarists building a pressurized planted aquarium CO2 setup
- Single planted aquarium installations
- Hobbyists who want the regulator, refillable CO2 cylinder, and tubing in one package
- Installations where simplicity and clean equipment layout are priorities
- Beginner and experienced aquarists seeking a straightforward CO2 system
- Planted aquariums using diffusers, inline atomizers, or CO2 reactors
The GRO System is not limited to a particular aquarium size. Appropriate CO2 delivery depends on plant demand, lighting, circulation, diffusion method, surface agitation, and overall system configuration.
For aquarists who prefer dual-stage pressure regulation or a modular manifold platform, GLA also offers complete CO2 systems built around the DS-Mini and PRO-DS regulator families.
Why Choose the GLA GRO CO2 System?
The GRO CO2 System combines the core components needed to establish a refillable pressurized CO2 setup while keeping the installation compact and straightforward.
- Coordinated CO2 Package: Regulator, refillable aluminum cylinder, CO2-resistant tubing, and tank seal included
- Compact Piston Platform: Streamlined configuration for clean, efficient installation
- 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
- System Protection: Integrated pressure relief valve provides an additional level of protection
- Refillable Cylinder: Includes a 5 lb aluminum CGA-320 CO2 cylinder that can be filled locally
Precision Control & Automation
The GLA GRO combines a precision needle valve, electric solenoid, integrated working-pressure gauge, and bubble counter into a compact regulator 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 measurement of dissolved CO2. Actual CO2 requirements vary with aquarium volume, plant mass, lighting, circulation, diffusion efficiency, and surface agitation.
Refillable 5 lb Aluminum CO2 Cylinder
The GRO CO2 System includes a refillable 5 lb aluminum CO2 cylinder with a standard CGA-320 connection. The cylinder ships empty and must be filled by a local CO2 or compressed-gas supplier before use.
One- and two-cylinder package options are available. Select the cylinder quantity that best fits your installation and CO2 supply needs when ordering.
Important: CO2 cylinders ship empty.
Engineering & Performance
- Laser-Precision Metal-on-Metal Valve Seat: Engineered for consistent regulation and long-term operation
- Multi-Stage Micron Filtration: Filtration at the inlet and outlet helps protect internal pneumatic components
- 360° Adjustable Needle Valve: Allows flexible positioning during installation
- Integrated Working-Pressure Gauge: Provides a visual reference for regulator output pressure
- Integrated Pressure Relief Valve: Provides additional system protection
- Durable Aluminum Regulator Body: Compact construction designed for demanding aquarium environments
- Premium Pneumatic Components: Selected for precision, reliability, and long-term performance
- USA Inspection & Testing: Each regulator is pressure tested and leak checked prior to shipment
Specifications
- Installation: CGA-320 standard USA CO2 cylinders
- 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
- Standard CO2 Distribution: One aquarium
- Multi-Aquarium Expansion: Optional GLA GRO CO2 Splitter available separately
- Included Cylinder: 5 lb refillable aluminum CO2 cylinder
- Cylinder Quantity: One or two cylinders selectable at purchase
- Included Tubing: 10 feet of CO2-resistant aquarium tubing
What’s Included
- GLA GRO CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision needle valve
- Integrated bubble counter with check valve
- Selected quantity of 5 lb aluminum CO2 cylinders (ships empty)
- 10 feet of CO2-resistant aquarium tubing
- GLA OEM CO2 tank seal
Please Note: A compatible diffuser, inline atomizer, or CO2 reactor is required to deliver CO2 into the aquarium and is sold separately. The included CO2 cylinder ships empty and must be filled locally before use. For added protection against backflow, we recommend using a compatible inline check valve in your CO2 installation.
Frequently Asked Questions
Does the GRO CO2 System include everything I need?
The system includes the regulator, refillable CO2 cylinder, CO2-resistant tubing, and tank seal. You will also need a compatible diffuser, inline atomizer, or CO2 reactor to introduce CO2 into the aquarium. The included cylinder must be filled locally before use. For added protection against backflow, we recommend using a compatible inline check valve in your CO2 installation.
Does the CO2 cylinder arrive filled?
No. CO2 cylinders ship empty and must be filled by a local CO2 or compressed-gas supplier before use.
Why are one- and two-cylinder options available?
The system can be ordered with either one or two 5 lb aluminum CO2 cylinders. Select the cylinder package that best fits your CO2 supply and installation needs.
Can the GRO CO2 System run more than one aquarium?
Yes. The standard system is configured for one aquarium, but the optional GLA GRO CO2 Splitter can be added to provide independently adjustable CO2 outlets for multiple aquariums. Operating additional aquariums will increase total CO2 consumption.
Can I use a diffuser, inline atomizer, or CO2 reactor?
Yes. The adjustable 0–70 PSI output allows the GRO to be configured with many planted aquarium CO2 delivery methods when operated within the pressure and flow requirements of the selected equipment.
What size aquarium can I use the GRO System on?
The regulator itself is not limited to a specific aquarium volume. Appropriate CO2 delivery depends on plant demand, lighting, circulation, diffusion method, surface agitation, and overall system configuration.
Is the GRO CO2 System suitable for beginners?
Yes. The GRO System provides a straightforward way to establish a refillable pressurized CO2 setup while retaining precise adjustment, automatic solenoid control, integrated pressure monitoring, and the component quality expected from GLA equipment.
Optional Multi-Aquarium Expansion
The GLA GRO CO2 System is designed primarily as a streamlined single-aquarium system but can be expanded using the optional GLA GRO CO2 Splitter.
Each splitter outlet includes its own precision needle valve, allowing CO2 flow to be adjusted independently for each connected aquarium.
- Expand one GRO regulator to multiple aquariums
- Independent CO2 adjustment for each outlet
- Direct compatibility with the GLA GRO regulator platform
- Compact expansion without replacing the regulator
Choosing the Right GLA CO2 Platform
The GLA GRO is our streamlined piston platform for aquarists seeking compact, precise CO2 control. The DS-Mini combines dual-stage pressure regulation with a compact modular design, while the PRO-DS is our full-size dual-stage platform with expanded pressure range, dual-gauge instrumentation, and modular configuration options.
The GRO CO2 System packages the GRO regulator with a refillable aluminum CO2 cylinder and CO2-resistant tubing, providing a convenient foundation for a complete planted aquarium CO2 installation.
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: A wrench should only be used to secure the regulator to the CO2 cylinder. Damage resulting from improper use of tools, excessive force, or incorrect installation methods 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
-
Easy to set up - Helpful support
This is my first adventure in to a C02 set up. I emailed before finalizing my purchase to make sure I got everything I needed and Robbie was kind and helpful. It was easier to set up than expected, just took a few minutes. Honestly, the hardest part was finding a place to fill my tank! Ordered it on a Tuesday, I believe, and it arrived by Friday. Excited to add some fun plants to my tank. Thanks again!
-
Heavy duty co2 system.
For a co2 regulator being so compact it sure weighs a lot. Its a dense hunk of metal that goes on buttery smooth. It took me all of 5 minutes to get up and pumping. Adjusting co2 was super easy, Im amazed I was able to do this by myself. Thanks to the instructions and videos they provide its a piece of cake. The GLA co2 tubing was much nicer than anticipated and meshed perfect with the inline co2 reactor. My tank is loving this system!
-
CO2 regulator
Works perfect and easy to install! Thanks
-
Stellar Co2 system.
This is only my second co2 system so Im not an expert. This kit was leaps and bounds from my co2art regulator, which was more of a lightweight paper weight that could barely even do that as a paper weight. This Gro system comes with an actual industrial grade co2 cylinder,tubing and inline check valve. The only thing you need to add is a co2 diffuser. I opted for GLA's 90mm Atomic diffuser and the pair are absolutely perfect. Its been about 9 months now and I could not be happier.
-
Best kit for a great price.
I really was not sure what to expect as this is my first co2 system. With no experience I was able to install this system in a matter of minutes. Everything was super easy to follow, they even have some youtube videos explaining things. Customer service was like no other experience Ive had online before. They answered questions at all hours even on a Sunday. What the heck more could you ask for? Thank you GLA for making this so easy.
-
Love this product
I like the simple yet well-built product. I also appreciated GLAs customer support since I needed a few questions answered as I was setting this up.
-
GLA Gro system
Quality well built CO2 system.
-
Great system for beginners
This is my first experience with injected CO2 and I gotta say you cannot go wrong with the GRO system if you’re new to CO2 in aquariums. I got mine along with an in-line aluminium diffuser from GLA in September but I didn’t set it up until December when I finally got my hands on a tank the size I needed (thanks pandemic for messing up with supply chains! Sigh!). At times I was dreading the day of finally setting up my aquarium because it mean to put together this CO2 system, thinking it’d be nightmare of a precision work cuz we’re talking about pressurized gas. Far from it! The instructions that came in the package are super clear and fool-proof and I got my GRO system set up and running in less than an hour! Besides tinkering with the appropriate rate of injected CO2 for your tank, the GLA GRO CO2 system, when connected to a timer, is practically “set it and forget it!” (until you have to refill your CO2 cylinder, that is).
-
So happy!
Fantastic regulator I could not be more thrilled with. Ive used many other brands of co2 regulators for my planted tank and reef tank, but GLA takes the cake when it comes to co2 systems.
-
Great kit and fantastic service
This Gro system has exceeded my expectations by a mile. For a complete system with cylinder this kit is hard to beat. Its backed by GLA full customer support system which as a newbie I was totally grateful for. My 75g tank is a showpiece in my house and the topic of discussion every time we have guest. Its the GLA co2 system that really propels the discussion in my home when guest see it. It looks very sleek,clean and neat. Its perfect for the compact space I have under my 75g tank. I do love this regulator:)
-
Stellar system
This is one great aquarium co2 system. Everything from form to function of this system has been exactly what I wanted and is why I went with GLA. The only thing this system did not come with is a co2 diffuser, which I totally understand because there are a tone of sizes. GLA was there for me with helping me choose a co2 diffuser for the tank Im setting up. I opted for the co2 reactor they sell and it has been working flawless now for almost 2 months. You will notice the quality the minute you set this co2 system up. Super easy instructions and only a few minutes of install time. I spent the next few hours just marveling how nice it all was lol.
-
GLA Grow system
So happy with it!
-
Repeat purchase
I lost my first unit in a cross country move. I knew I would be dissapointed by a different replacement. The directions were easy to follow and all my connections were good the first time around also, the gas cylinder was cheaper than I could source it myself.
-
CO2 System
Purchased one of GLAs co2 systems and Im very happy with this system. It works very well and is of very good quality. Their customer support is A+ with a friendly and fast response. I will recommend them to anyone looking for a co2 system.
-
Great All Around
Products where packaged securely (best I've ever seen). Setup was a snap with easy to follow instructions. Bubble count was easy to set and remains consistent. Customer Service is second to none. Glad I sprung for a GLA setup. WELL WORTH THE INVESTMENT!!!
-
Outstanding!
Setting it up was easy. After setup, it’s an experiment until you get the ppm right but the needle valve makes fine tuning a snap. Customer service is also excellent
-
So far so excellent
First co2 system so I jumped right in with the gro1 with the two block manifold. Setup was very simple and so far everything is working perfectly. If it continues to work this way they're will be no issues with the 5 star rating which I'm assuming will be the case.
-
Awesome product
It was a bit intimidating at first, but assembly was easy.. overall I would recommend it to anyone looking into a co2 system
-
Excellent product and great customer service
I have wanted one of your GLA CO2 systems for several years and was finally at point where I felt comfortable making the investment. I made the purchase, but not for myself. I gave this system to my Dad who also loves keeping planted aquariums. At first I think he thought there was going to be a lot of reading and research necessary but he said it was so easy to get setup! Thanks for answering my emails and shipping so quickly right before Christmas.