Description
GLA GRO Planted Aquarium CO2 Regulator
Precise CO2 control in a compact, easy-to-use design.
The GLA GRO Aquarium CO2 Regulator combines piston-type pressure regulation, precise CO2 adjustment, and automatic operation in a compact design. Its integrated components make it easy to control and monitor CO2 delivery without requiring a large regulator assembly.
GRO can supply a single planted aquarium or multiple aquariums with the optional GRO CO2 Splitter. Each regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.
At a Glance
- Pressure Regulation: Precision piston-type mechanism
- Cylinder Connection: CGA-320 standard USA CO2 cylinders
- CO2 Adjustment: Precision needle valve
- Automation: Integrated electric solenoid
- Monitoring: Working-pressure gauge and bubble counter
- Expansion: Optional GRO CO2 splitter for multiple aquariums
Best For
- Single planted aquariums of various sizes
- Compact installations where equipment space is limited
- Aquarists who want precise CO2 adjustment and automatic timer control
- Existing CO2 setups using compatible CGA-320 cylinders
- Multiple aquariums with optional GRO splitter expansion
Why Choose the GLA GRO?
GRO combines the essential components for precise, automated CO2 delivery in one compact regulator. Here's what its features do for your aquarium setup.
- Piston-Type Pressure Regulation: Reduces cylinder pressure to a stable, adjustable working pressure for consistent CO2 delivery.
- Precise CO2 Adjustment: The needle valve allows fine control of CO2 flow and can be rotated 360° for convenient positioning.
- Automatic CO2 Control: The integrated solenoid lets you turn CO2 injection on and off automatically using a timer or compatible controller.
- Easy Monitoring: The working-pressure gauge displays regulator output pressure, while the bubble counter provides a visual reference for adjusting CO2 flow.
- Integrated Protection: A pressure relief valve provides additional protection, while the bubble counter check valve helps prevent aquarium water backflow. Micron filtration helps protect internal regulator components.
- Durable Construction: An aluminum regulator body, precision metal-on-metal valve seat, and quality pneumatic components are designed for long-term use.
- USA Inspection & Testing: Every GRO regulator is individually inspected, pressure tested, and leak checked in the USA before shipment.
What's Included
- GLA GRO CO2 Regulator
- Integrated electric solenoid
- Integrated working-pressure gauge
- Precision adjustable needle valve
- Integrated bubble counter with check valve
- GLA OEM CO2 tank seal
What You'll Need Separately: A compatible refillable CO2 cylinder, CO2-resistant tubing, and a diffuser, inline atomizer, or reactor are required to complete your CO2 installation. These items are sold separately.
Need a cylinder too? Explore our GLA GRO Complete CO2 System, which includes the GRO regulator, a refillable aluminum CO2 cylinder, and selected installation components.
Optional Multi-Aquarium Expansion
The optional GLA GRO CO2 Splitter allows one GRO regulator and CO2 cylinder to supply multiple planted aquariums.
Each splitter outlet has its own precision needle valve, so you can adjust the CO2 flow independently for each aquarium without replacing your existing regulator.
Technical Specifications
- Model: GLA GRO Aquarium CO2 Regulator
- Pressure Regulation: Piston-type mechanism
- Cylinder Connection: CGA-320, standard USA CO2 cylinders
- Adjustable Working Pressure: 0–70 PSI
- Pressure Monitoring: Integrated working-pressure gauge
- Needle Valve: Precision, 360° adjustable
- Automation: Integrated electric solenoid
- Bubble Counter: Integrated, with check valve
- Pressure Relief: Integrated pressure relief valve
- Regulator Body: Aluminum construction
- Valve Seat: Laser-precision metal-on-metal
- Filtration: Multi-stage micron filtration at inlet and outlet
- Multi-Aquarium Expansion: Optional GLA GRO CO2 Splitter
- Quality Control: Individually inspected, pressure tested, and leak checked in the USA
The GLA Difference
20 Years of CO2 Expertise. A Commitment That Goes Beyond the Equipment.
For 20 years, Green Leaf Aquariums has specialized in CO2 equipment for planted aquariums. Throughout that time, we've remained committed to advancing the quality, precision, and reliability of aquarium CO2 regulation. Our experience, long-standing manufacturing partnerships, and close relationships with our customers have helped shape the equipment we offer today.
We don't believe in standing still. We work closely with our manufacturing partners to continually refine our products, incorporate real-world customer feedback, and introduce meaningful improvements. From precise piston-type regulation to advanced dual-stage designs and modular expansion, GLA has consistently worked to raise the standard for aquarium CO2 equipment through thoughtful engineering and innovation.
Every GLA CO2 regulator is individually inspected, pressure tested, and leak checked in the USA before shipment. We take quality control seriously because we understand the importance of dependable CO2 delivery and the trust our customers place in our equipment.
But what truly sets GLA apart is the company behind the products. We're a small business with a personal commitment to the people we serve. We take pride in helping customers select the right equipment, answering technical questions, providing installation assistance, and offering knowledgeable support long after the purchase. We're invested in our customers' success, and we genuinely care about their experience.
That commitment is backed by our Limited Lifetime Warranty on GLA CO2 regulators and systems for the original purchaser, covering qualifying defects under our warranty terms.
When you choose GLA, you're investing in more than precision-engineered CO2 equipment. You're choosing two decades of specialized experience, continuous product development, careful quality control, and a business that stands behind what it sells.
Twenty years of experience. A continuing commitment to innovation. A company that stands behind you.
Frequently Asked Questions
What does piston-type pressure regulation mean?
Piston-type refers to the internal mechanism that regulates CO2 pressure. GRO reduces cylinder pressure to a controlled, adjustable working pressure for aquarium use.
What size aquarium can I use GRO with?
GRO is suitable for a wide range of planted aquarium sizes. CO2 requirements depend on lighting, plant demand, circulation, and diffusion equipment rather than aquarium volume alone.
Can GRO supply multiple aquariums?
Yes. The optional GRO CO2 Splitter allows one regulator to supply multiple aquariums, with independent CO2 flow adjustment for each outlet.
Can I use GRO with an inline atomizer or CO2 reactor?
Yes. GRO supports common planted aquarium CO2 diffusion methods, including in-tank ceramic diffusers, external inline atomizers, and compatible reactor systems.
Does GRO include a CO2 cylinder?
No. This listing includes the GRO regulator and its integrated components, plus the GLA OEM CO2 tank seal. The cylinder, CO2-resistant tubing, and diffusion equipment are sold separately.
Which CO2 cylinders are compatible?
This GRO model uses the CGA-320 connection for compatible refillable CO2 cylinders commonly used in the USA.
Pre-Sales & Installation Support
GLA provides expert pre-sales assistance, equipment compatibility guidance, and installation support by email and text. Whether you're selecting accessories or setting up your CO2 regulator, we're here to help.
Support & Warranty
GLA Warranty: GLA CO2 regulators include a Limited Lifetime Warranty on qualifying mechanical manufacturing defects and a 2-Year Limited Warranty on qualifying electrical manufacturing defects. Coverage applies to the original purchaser and is non-transferable. For complete systems, regulator warranty coverage does not automatically extend to cylinders, tubing, or other accessories.
Service & Returns: GLA prioritizes repair whenever practical. CO2 regulators and systems are not eligible for voluntary returns. Warranty claims require GLA evaluation and authorization before equipment is returned for service.
For complete coverage, exclusions, service procedures, and domestic and international warranty terms, review our Shipping, Returns & Warranty Policy.
Customer Reviews
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Perfect
I dont know much about aquarium co2 systems, this was my first. Its been a couple months since I had it and its been absolutely great. The only thing I do is refill the bubble counter and wipe clean regularly with plant based metal cleaner. Its just so pretty I cant help but to keep it looking so good. Its the nicest piece of aquarium equipment I own and it was only $150. Very happy with all my purchases from GLA.
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Its awesome
This regulator arrived very well packed in a nice fitted box. Upon opening I was greeted with super easy to follow instructions. Literally took me 3 minutes to set up this co2 regulator. Im using this in a 30g aquascape I plan to enter in IAPLC 2020. Everything about this regulator was so smooth and tight. From the adjustment knob to the needle valve everything was super smooth, thats the best way to describe it. Your going to love this co2 regulator no doubt about it. I give it 5 stars and an A++ GLA.
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Excellent quality co2 regulator
Ordered this no a Wednesday and arrived to me on Friday. Very well packed with super easy installation instructions. I use this on my 75g tank and so far everything has been A+ perfect. I echo what many have already said that the regulator is truly buttery smooth. Dialing in bubble rate with this needle valve is beyond easy, so much better than my previous co2 regulator. A+ product all around.
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Fabulous co2 system
Love this co2 regulator. It was easy to set up in minutes. Thanks for helping me GLA!
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Perfect A+
I got this to add carbon to my 20g tank and its been about a month now. I really like the bubble counter being attached and the fact its able to swivel out of the way and be used without bubble counter. I opted for the complete system option because I needed a complete co2 system. GLA co2 system is absolutely worth every penny. Fantastic support and easy to follow directions.
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Fantastic!
So glad I went this route for my 60g tank. This regulator is very nicely built and very easy to install and adjust flow rate. I like that I can use this regulator for every cylinder type even though I likely will not use it for anything but full sized tanks. Now if only they had a sodastream adapter I would be set. This is an A++ co2 regulator, dont waste your money anywhere else because GLA has you covered.
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Love it
This regulator works so well and keep steady pressure. You can have inline accessories with this one. I love this regulator it was easy to set up and pretty standard function. GLA included a piece of co2 resistant tubing which is very high quality. They also send you instructions so even if you never setup a delivery system it won’t be a problem. I highly recommend this product.
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Beyond 5 stars
This is the third regulator that I bought and it’s the best one so far. While trying to install this product, I had a difficulty figuring out the instructions. I contacted the support team and within minutes, I got a response. I wasn’t able to finish the installation within the day because of my busy schedule but the support team walked me through, day and night while at work, responding promptly to my emails. I am very satisfied with their customer service and how the product works. What a great team! Thanks GLA!
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Awesome buy
This product is worth every penny and have the best support!
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Absolutley stellar build quality
This is my 3rd regulator from GLA over the last 10 years and I cant say enough how excellent the build quality is. Originally I had a shipping issue and some how they were able to correct the issue while in transit. Customer service over the years is unparalleled. You can rest assured your in good hands with GLA!
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Best product!
Very nice product! I'll back for shopping
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Gro 1
Bought this about 2 years ago and never looked back works great I even added a manifold no issues recommend to anyone who will listen
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Look no Further
I spent a lot of time trying to figure out how I was going to put my CO2 system together for my first planted tank. The regulator seemed to be the most difficult thing to find or put together yourself. The easier ones to find that were directed at aquarists all had a reputation of breaking or not working reliably. GLA's regulator looks like it's composed of quality materials and it has been working perfectly. Just spend the money and don't waste your time trying to find a budget regulator. GLA responded quickly to a question I had regarding the product but... I haven't heard back from them on two other emails related to plants. I'll keep shopping here because they have a great site and ship quickly. It would be nice to see more detail about the plants they offer as I have to search elsewhere for info on each one.
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Solid regular
Wow what a step up from the $60.00 China regulator from amazon. I can’t believe I wasted so much time readjusting my old unit day after day. The bubble adjustment on the GLA GRO1 is consistent, it’s been in operation for a couple weeks now.
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Very Well Built - Solid and Highly Accurate
I purchased the GLA GRO-1 and could not be happier. After researching a number of other units online I became concerned about where I might find a quality regulator for my new aquarium. Until I found this one. It has a large bubble counter, easy to read gauges and the needle valve is crazy accurate. The unit works great on my IOT timer however I did initially have a slight CO2 leak between the tank and the regulator. In the end it was simply a tightening issue however I wasn't sure how tight to make the connection against the nylon washer. Perhaps buying the permaseal adapter would have been a good idea however I didn't realize such an adapter was possible/available.
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Top notch Reliability
Durable well made regulator that works everytime.
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Just works out of the box
Arrived very well packed. Just works, i am happy
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Great Regulator
Arrived in protective packaging and in good condition. So far so good with this unit.
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Absolutely perfect
There are two things that are fantastic about this regulator. First, it is like a scientific instrument. It is made from brass and really high quality fittings that have been assembled by a human and everything is perfect right out of the box. The quality is really remarkable all around. gauges are super easy to read, bubble counter and airline input are very high quality. The second thing which may seem trivial unless you are an expert already at CO2 is the instructions. They are simple and perfect. I never could have figured out the Chinese version I almost bought. there are a lot of steps to doing it right and doing it in a way that does not fry your solenoid or low pressure valve.The instructions are almost worth the price of admission. Love a well made tool.
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Quality Regulator
Had it running for around 10 days now. Easy to setup, all in one unit. processing was a bit slower than I would have like but fast shipping and quality packaging. I will be expanding upon this regulator in the future.
