Description
GLA PRO-CO2 Reactor 5L – Maximum CO2 Saturation for Nature Aquariums
The GLA PRO-CO2 Reactor 5L is engineered for unmatched CO2 dissolution, delivering maximum efficiency with virtually zero waste. Built for serious aquascapers and high-tech planted aquariums, this reactor ensures stable, high-level CO2 saturation to support vibrant, healthy, and fast-growing aquatic plants.
Key Features:
- 5L High-Capacity Reactor Chamber: Designed to handle high-flow filtration systems while maintaining consistent CO2 saturation throughout the water column.
- Precision-Designed in the USA: Constructed from professional-grade, crystal-clear acrylic for durability and long-term performance (19" tall × 6" diameter).
- Whirlpool Diffusion System: The internal vortex chamber creates a high-flow whirlpool effect, ensuring complete CO2 absorption before water returns to your aquarium.
- Universal Tubing Compatibility: Supports 12/16mm, 16/22mm, and 20/25mm tubing for seamless integration with most canister filters and external pumps.
- Quiet, Bubble-Free Operation: Eliminates microbubbles and CO2 noise common with diffusers—ideal for display tanks and living spaces.
- Maximum CO2 Efficiency: Reduces CO2 loss and ensures every bubble is fully dissolved, saving gas and improving stability.
- Maintenance-Friendly Design: Wide body and removable top allow for quick cleaning and access to internal components.
Installation & Functionality:
- Connect the reactor inline with your canister filter’s return/output line.
- Attach CO2 tubing using the built-in Speedfit connection—a secure, tool-free fitting with an integrated on/off valve for precise CO2 control.
- Allow the vortex system to create a high-energy mixing environment that fully dissolves CO2 before water re-enters the tank.
- Adjust your CO2 rate to match the demands of your planted aquarium for optimal growth and stability.
Why Choose a GLA CO2 Reactor?
- Professional-Grade Performance: Built for high-demand aquascapes requiring stable and high CO2 levels.
- Enhanced Plant Growth: Provides consistent, fully saturated CO2 delivery that drives lush growth and stronger coloration.
- Ideal for Larger Tanks: Perfect for medium to large nature aquariums where diffusers cannot keep up with CO2 demand.
- Energy Efficient: Works flawlessly with existing filtration—no additional power required.
Built for aquascapers who demand uncompromising performance, the GLA PRO-CO2 Reactor delivers precise CO2 control, maximum dissolution efficiency, and superior plant health for the most demanding planted tanks.
Customer Reviews
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❤️Absolutely love this co2 reactor.
Coming from a smaller competing brand this thing blows every other reactor away in construction and overall performance. Zero co2 escapes this thing unlike the other brand I invested in. Whats even better is its quality, it’s built better from top to bottom and much larger in volume, in fact it’s huge and bigger than my co2 system. Tank drops a full 1.5ph in short time and pearls like crazy before my lights are out. GLA always brings top quality planted aquarium products.
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Beast of a co2 reactor, I mean it’s huge.
I come from a long history of using co2 reactors. My first one was from GLA about 16 years ago when they made large PVC reactors. I actually still have it in service today. Years later I adopted an Aquariumplants.com reactor which is basically a Cerges reactor. That was close to a nightmare to get dialed in and hated that stupid internal pump they implemented. I then purchased the plastic reactor GLA use to have listed on their site but appears to be no longer available. I actually like that one a lot except it’s to small in volume. Fast forward to now I have this giant reactor. It’s absolutely perfect. It’s build extremely well and the volume it has is exactly what I prefer. It handles a big co2 flow rate and no co2 is able to escape. It’s bigger than my actual co2 system, it’s that big. Always loved GLA products because they bring quality stuff that delivers. Customer service is second to none.
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Changed my Dutch scape into an absolute garden.
This co2 reactor completely changed my plant beds. I’ve struggled for months trying to get stable co2 in this tank. It’s a 75g with a 30g sump so I was always making adjustments and almost gave up. I’ve had this installed now for 3 weeks and it’s been such a blessing. I'm more hands off now and spend more time now figuring out my fert dosage. Trimming,dosing and maintenance are all I do, I no longer mess with my co2 system. Plants look fantastic and I’m now making a little money back selling my plant clippings on Facebook and forum pages.
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This is a quality built co2 reactor I’ve been looking for.
I bought two of these for my two aquascapes. One uses an Eheim 2262 and the other uses an Eheim Pro. I like that this reactor comes with several sets of hose connectors. I didn’t have to glue any adapters or make any modifications. Everything came ready out of the box including a whole roll of Teflon tape. The volume of this reactor is massive, much larger than competing brands so it’s able to hold up well for my 220g tank using the big Eheim 2262. After about 3 days of adjusting my co2 bubble rate I have a nice 1.3 ph drop in short time. Nice and gradual and not stupid fast where it can stress my fish. On my 120g tank with the Eheim Pro I get the same exact outcome. Except this tank is half the volume so I use much less co2. I’ve used a competing brand of GLA’s reactor that was smaller and wasted co2, co2 was actually escaping the reactor. To me that’s a failed design. No co2 should ever escape a co2 reactor. If it does , you clearly have a failed design. With this large format reactor from GLA NOT A SINGLE BUBBLE ESCAPES. Because of this I rated it 5 stars ⭐️ because it’s a quality built unit and does what it’s supposed to do without wasting a single bubble of co2. Thank you GLA staff for helping me and bringing us a great product.
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GLA PRO-CO2 Reactor 5L
GREAT QUALITY REACTOR,NO NOISE,NO LEAK,DISSOLVES 100% OF CO2,VERY HAPPY.
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Totally transformed my tank.
Not new to reactors but new to GLA’s co2 reactor. This is an absolute beast and does the job very well. I trim stem plants every few days now and have been replanting like crazy. Totally worth the investment.
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My first time with a co2 reactor and absolutely love ❤️ it!
I’ve only used co2 diffusers the last 2-3 years and while they’ve been great I never was a huge fan of all the billions of micro bubbles. I took the plunge this month on this reactor and it’s been just wonderful. My co2 levels are perfect and keeps my drop checker in the yellow zone lol, yeah I know but my fish don’t mind and my plants have never pearled as much as they do now. Great product and even better customer service, they are just so kind. :)
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This is the co2 reactor.
I’ve tried a few co2 reactors and this thing blows them away. It’s huge, let’s say that first. Second, zero co2 escapes this reactor so every bubble you inject gets saturated. If you’re new to using a co2 reactor know there’s a 2-4 day tune in time. It takes you a few days to get your co2 levels perfect. And when you do they are absolutely perfect. I built a raspberry pi pH controller to monitor my GLA CO2 System and my data log reports are rock steady for my co2. I love this thing it’s been an absolute dreamy unit.
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This co2 reactor is a game changer for my tank.
I wasn’t sure how this would turn out after using regular inline diffusers but man is this thing awesome. Water is crystal clear and at the end of the day the amount of pearling is crazy! Took me a few days of dialing in as I suspected and I definitely won’t be going back to traditional diffusers ever. Just bought a second one for my new scape underway. Thank you GLA customer service you guys are amazing!
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Best purchase for my 150g tank was a GLA ful co2 system and reactor.
Pumped on this co2 reactor. Saturates every bubble I inject and my co2 levels are rock steady. Took a few days for me to dial in but man it’s awesome. Plants pearl like crazy now. Looking forward to adding one to my 80g tank next week.
