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
- Warranty: GLA Limited Lifetime Warranty
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
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
Limited Lifetime Warranty: GLA CO2 regulators are covered against qualifying defects in materials and workmanship for the original purchaser. Coverage is non-transferable, requires proof of purchase, and is subject to proper installation, use, and maintenance. GLA may repair, replace, or issue store credit for qualifying claims.
Return Policy: Pressurized CO2 equipment is non-returnable and non-refundable. Qualifying defects are handled separately through warranty support.
Warranty Exclusions: Coverage does not include improper installation, misuse, excessive force, unauthorized repairs or modifications, contamination, corrosion, accidental damage, or normal wear. Damage from improper wrench use is excluded. Cylinders, tubing, cartridges, and other accessories are not covered unless otherwise specified.
For complete terms, exclusions, and claim requirements, please review our Shipping, Returns & Warranty Policy .
Customer Reviews
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Definitely high quality
If you’re in the market for one absolutely grab a GLA regulator. High quality, fast shipping and customer support is the best. Thank you GLA
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A piece of mind quality
The regulator is compact, feels of solid quality and it was very easy to install. The Needle valve is precise and consistent.
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This thing is awesome!
Exactly what I needed. Compact and built like a steel brick. Zero end of tank dumps with a very precise working needle valve that keeps the bubble rate steady every day all the way to the last drop of co2. Absolutely love it.
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GLA GRO Aquarium CO2 Regulator
For over a decade, GLA has been our go-to company for their entire line of CO2 regulators. They are beautifully crafted, well-built, and have been very reliable through all the years. Infinity Aquarium Design of Los Angeles
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This Gro regulator is an absolute unit.
Love the compact build and heavy duty feel to this regulator. Almost like it’s filled with iron lol. It’s heavy! Never have to fool around with settings either, I just leave it and it works. It helps to follow instructions and the best part is GLA’s customer service, it’s unbeatable especially that text service they offer, just amazing company!
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Premium Co2 equipment!
Per the advisement of my local club I purchased this regulator to replace my Fzone. What a gem, better quality and reliability I can trust day to day. No kore fiddling with adjustments thank god, it started feeling like a daily chore with Fzone. I’m finally free from that cheap prison lol
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What a great buy.
Searched for a few weeks and kept coming back to GLA. All the Facebook groups,Reddit and Locsl clubs all recommend GLA for quality and longevity. The warranty is amazing so I had nothing to lose. I’ve had this operating on a Bluetooth timer that has an app on my phone. Also has a cool water leak detector that super handy. Yo-Link is the brand of timer I use and I highly recommend them. This regulator is super solid and not at all wimpy. The whole thing from top to bottom is built well and is steady everyday. I’ve not done anything but shine it up from time to time to keep it looking nice, I love it.
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GLA is top quality and very friendly staff.
Pleased with this regulator. Replaced my Co2Art regulator that didn’t last 9 months. This was a noticeable difference out of the box. Very happy with GLA
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Thank you GLA and team!
My plants are absolutely flourishing. I’ve had this regulator for 8 months and today was my first cylinder swap. I must say, during the initial first 8 months I never had to make any adjustments as the tank matured. I set the timer for an 8hr photoperiod and it’s been rock steady. Until the very last few days I noticed my drop checker was blue vs the regular green, I’d ran out of co2 and didn’t notice. Refilled today and was back up and running in a few hours. It’s been absolutely wonderful. I’ve started selling my clippings on Facebook and in due time my hobby is going to pay for itself! Loving GLA products across the board.
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Very nice quality
Very high quality for such a bargain price. Upgrade for sure from Fzone. Really enjoying the super butter smooth needle valve bubble adjustments. So much better than Fzone.
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basic Gla mini Gro
works as it should. seams well built and time will tell how good this reg.is.
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Professional quality at a good price.
I replace my Ultum Nature System regulator with this and the difference in quality is immediately noticeable. It’s heavy as all heck, as if solid iron. Whereas the Ultum Nature regulator was weightless. More so the issue with the needle valves adjustment of the bubble rate was flaky and you can feel it was scratchy and not reliable day to day. I installed this almost 3.5 weeks ago and the setting is spot on everyday. The needle valves adjustment, vast improvement noticeable right away. I think if you are in the market for a budget friendly but high quality co2 regulator consider going with GLA. You get 100% for what you pay vs that cheap stuff. While the cheap co2 might look good, they know that that’s all they have going. From a functional standpoint Ultum isn’t worth it by a long shot, but GLA.
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Love love love it!
Our first successful aquascape is doing very well thanks to co2 from this regulator. The customer service was unparalleled. You have a customer for life, GLA.
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Love this co2 regulator.
Only my second co2 regulator I’ve owned and this is a real treat in comparison to what I was using. Right away you can feel it’s high quality construction. It’s definitely super heavy for its size and installing it was simple and quick. It’s been pumping along for a few weeks now and couldn’t be more pleased.
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Replaced my Fzone regulator and couldn’t be happier!
After months of frustration I finally took the dive with a GLA regulator and let me tell you! Such a relief to have something that works everyday as it should. I felt I had to constantly fight that Fzone regulator daily. It started to affect my mood through the whole day. After much frustration and installing the Gro I sleep well with a big old smile on my face, it’s even bigger in the morning when I wake up and I see it running just like I left it days prior after installing. David at GLA was very kind and supportive and I was even helped via text message with a tech named John. Both very helpful and supportive. They treated me like family and was an absolute breath of fresh air. Thank you GLA and team for providing great products and service. You have a customer for life.
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Co2 regulator is amazing.
Heavy duty regulator and was cake to set up. Looks so much better and works way better than my Fzone regulator. Stay away from those pieces of garbage, wasted my money on cheap crap and never again! GLA is a night and day difference.
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Best of the best always go with GLA.
If your new to co2 GLA is the source. I was fortunate ot meet these guys at the aquatic expo. I bought this and its been great! This thing is very high quality,easy to install and has been very good to my 29g tank.
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This is a gem of co2 regulator.
Happy with this purchase. Definitely an upgrade from FZone crapbox I was using. This is a refined piece of equipment. You notice that right out of the box. One tip though! The instructions missed a basic part where you have to thread the fitting into the regulator. No biggie, GLA provides the tool and everything. Easy as screwing in a lightbulb! It purs with effortless stability that I dont have to mess with day to day. Rock solid!
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Very nice!
Pleased with this upgrade from my Fzone. That didn’t even last 4 months. Today I came to buy another one with the GLA splitter. This regulator is meaty, it’s very heavy and feels like everything is extra solid. Whereas the fzone felt wimpy and hollow. Almost weightless, this is the opposite! Great product and love their customer service end. Super nice people.
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GLA quality is impressive.
This is a high quality built regulator. Impressive weight to this regulator but more so the effortless tubing of bubble rate. It’s rock steady everyday.
