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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Wonderful co2 regulator.
This is a wonderful co2 regulator. Im new to co2 and reached out to GLA for advice and ordered this. Arrived quickly and packed with much care(thank you!). The instructions and video made it a walk in the park, so pleasant. Ive refilled only twice in the year and its been spot on perfect every time. I love it.
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Very nice regulator worth the investment.
This definitely improved my low tech aquascape. You’d be surprised to see how much better things grow with co2. I’m enjoying every minute of my planted aquarium.
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We love it and bought 6!
We started with one and now have 6 of these going in our plant nursery. These are really well made, heavy duty and super easy to use anybody could use one!
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Wonderful!
Great working kit here. Fits perfect in my space and has been consistent every day. I’ve refilled my cylinder twice in two years and aquascape has been glowing beautifully.
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Very happy
Couldn’t be happier! I came back today to buy another one lol. My first one is a little over a year old and it’s like brand new today. Works extremely well.
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I love it!
So perfect for my small space but wanted something reliable. This guy has been wonderful. Very pretty regulator and nice finish to it. It only took me a few minutes to install. I was shocked how easy it was. I felt confident after that lol. You will love this regulator its been just terrific.
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Its wonderful
I got this for a second tank upstairs and its been really nice. No issues, installation was simple and I like how well its made. Its almost a year old and looks brand new. Its super heavy and compact and no doubt it will last me forever.
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GLA GRO AQUARIUM CO2 REGULATOR
The device works as advertised. I've purchased this item several times in the past, and the quality continues to impress.
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Fantastic build quality and service.
Its been a long time for my review lol. I have had this regulator for over a year now and its been just flawless. My tank and fish are always happy so that makes me happy. Ive even installed this incorrectly several times due to my idiocracy, and still works like a champ to this day. Its just been a real gem.
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Exceptional quality and service.
Very high quality, heavier than you would expect. Its super dense, installation was easy and my tank is pearling!
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Super nice I love it!
Super fast shipping,great packing and installation was a sweet breeze. Loving GLA products:)
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Small and mighty.
Super nice and very well designed. It came with tools and easy to follow instructions. I like that this regulator fits every cylinder available. Its been terrific since we've owned it.
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Brilliant and easy co2 system.
So simple and easy to use! Exactly what I wanted.
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Precise and quality to boot.
I really like these regulators. Very well made and the needle valve is just fantastic. Now I’m eying the new Mini-DS
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Regulator
Good directions Very accurate easy control
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Buy with confidence because this bay rocks!
Compact,heavy duty and precision flow. I love this GLA co2 regulator. I decided to bypass the bubble counter because I simply did not need it. It comes ready for a factory tubing fit directly to the needle valve. I secured it via the bubble counter tubing grip nut for a factory fit. Its not even more compact and in my opinion sleek. Working with GLA was an absolute breath of fresh air.
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Love it!
As always, fast delivery and terrific products from GLA. A+
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Beautiful well made co2 regulator.
My first co2 regulator go me lol! Seriously though, its been amazing. I wasn't sure of my tank warranted the co2 but my plants are happier and I can now grow a much more wide variety of plants. I have never installed one of these so I was a bit nervous at first. I even had GLA on text for stand by, it was like no other customer support I have ever experienced. Thankfully I did not need any help. I was caught off guard on how easy it was, I even questioned myself several times. It was a tremendous growing experience for me. As a beginner I can assure you this system is flawless. It came with everything I needed but most admirably was the customer support.
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Stellar co2 equipment from GLA.
Long time veteran customer of GLA since 2006. This compact GLA regulator is extremely well made and super easy to use. Its compact fit looks and fits great in my minimalistic cabinet. Bubble rate is rock steady and effortless to tune. Came with a wrench and sweet decals!
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Wonderful compact co2 regulator.
Pleasantly surprised with this GLA co2 regulator. Great packaging and speedy delivery. Came with necessary tolls for installation,manual and stickers. Upon opening you will notice off the bat its weight, nice and heavy. It took me a few short minutes ot get it installed and I was off and pumping. Super easy installation and its purring like a kitten 7 months later. Bonus, this model will fit all cylinder types! Whats not to love about this?
