Description
GLA PRO-CO2 Reactor 5L – Maximum CO2 Saturation for Nature Aquariums / Planted Tanks
Our GLA PRO-CO2 Reactor is engineered for unmatched CO2 dissolution, delivering maximum efficiency with zero waste. Designed for serious aquascapers, this reactor ensures stable, high-level CO2 saturation, optimizing plant health and growth in high-tech nature aquariums.
- 5L High-Capacity Chamber – Handles high-flow filtration while maintaining consistent CO2 saturation.
- Precision-Designed in the USA – Built from professional-grade acrylic (19" tall × 6" diameter) for durability and performance.
- Whirlpool Diffusion System – Creates a high-flow vortex, ensuring complete CO2 absorption before water returns to the aquarium.
- Universal Fit – Compatible with 12/16mm, 16/22mm, and 20/25mm tubing, seamlessly integrating with canister filters and external pumps.
Installation & Functionality
1️⃣ Connect inline with your canister filter’s output.
2️⃣ Attach CO2 tubing using the easy Speedfit connection—a secure, tool-free fitting with a built-in on/off valve for precise CO2 adjustment.
3️⃣ Let the vortex effect optimize CO2 dissolution, ensuring full saturation before water returns to the tank.
4️⃣ Fine-tune CO2 levels to meet the demands of your planted aquarium.
Built for aquascapers who demand professional-grade performance, the GLA CO2 Reactor delivers precise CO2 control, unmatched efficiency, and superior plant health.
Customer Reviews
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GLA always has the best co2 equipment.
Not sure why anybody would go anywhere else for co2 gear. I remember way back in 2006 when GLA first came onto the scene. They were just 3 guys hand building everything. Always great products and service. Fast forward 20 years and these guys are still at it! It was fun talking to them when we had only forums to discuss ideas and watching them bring products nobody had ever seen before. Good to see they are still at it. This reactor is a testament to GLA’s continued efforts to bring quality co2 gear to us. I hooked this reactor up to a Hygar variable speed pump and it’s just amazing. Zero complaints at all. Zero loss of flow as well compared to my old reactor. One good thing to note is this reactor has no 90* bends anywhere. That’s plumbing 101 if you want flow to stay up to par. I just hope my cat doesn’t try to use it as a scratching post, it’s so big and I noticed my cat has taken a keen interest into it lol.
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Best co2 reactor Ive ever seen or used.
I have used countless diffusion methods mostly PVC reactors and Cerges type reactors. However this one was very intriguing so I placed my order a few weeks ago. My tank is absolutely gleaming with massive amounts of pearling. This reactor is built solid and I should stress thats its bigger than my 5lb co2 cylinder, its nice and huge! GLA provided all the hookup parts one could ever need which was very nice. I want to add, working with GLA has been a pleasurable experience in itself. They were very kind and helpful people who even held my hand at fine tuning everything. By listening to Johns insight the amount of pearling my tank experiences is mind blowing. if you are in the market for a co2 reactor I would strongly advise this jewel here. GLA knocked it out of the park with this one.
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This is the reactor if you are looking for a co2 reactor.
The photos don’t do this monster justice. I received this on Thursday and it’s now Friday night. Two days of operation and one day of fine tuning. This reactor is amazing, 100% saturation no bubbles escape. Plants are very much pearling by evening time. If you need a high quality co2 reactor, this is it my friend.
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Holy cow!
What a beast of a reactor. This thing came with all the various hose barb connections to hook up to a closed loop I made specificity for this reactor. Using a marine DC pump with controller allowed me to fine tune the flow rate going into the reactor. I’ve got a tremendous amount of pearling in my tank by 1:30/2pm . I never had that with my standard diffuser, to me that’s a game changer. I’m curious to see what adding a ph controller would do, I’ll leave that for another day though. This thing is awesome!
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GLA always has the best co2 equipment.
For decades I’ve always come to GLA for my co2 gear and essentials. After being out of the joint the last year I started back up this fall piecing my system together. I received my reactor yesterday and it’s been going now for 2 days and it’s been a treat to see my plants pearl like crazy. I never liked the 7-Up look from normal co2 diffusers, but I didn’t expect my plants to pearl so much my tank looks like 7-Up again lol. O my this time its oxygen. My Fluval FX powers the reactor and it’s absolutely beautiful. I’m looking forward to GLA figuring out a method to inject fertilizer into the reactor from my autodoser. After conversing with David at GLA he says it’s already in the works and should be ready any day. Supposed to be plug n play with the reactor so I’m really looking forward to that.
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One heck of a co2 reactor.
This is my first true co2 reactor as I come from the old Rex Grig era of pvc reactors. Using an Oase canister filter seems to work like a champ. I will say my pvc reactor was working ok but made loads of noise and started leaking which isn’t my favorite. I wanted something quieter and came to GLA to order there apparently older style acrylic reactor. Turns out it was made of plastic vs acrylic and smaller in size. I ordered this new one and installed it and so far it’s dead silent. I use an Oase skimmer on my tank to keep the surface clean and was told this will offset some of the co2 I’m injecting. Drop checker is a decent green as of 6pm today. I suspect I’ll be making adjustments as I go along. So far the quality of the build is top notch. Exactly what I see with my more expensive reef tank calcium reactor. Similar concept here all around. Really liking this unit and looking forward to see how it ages. I’d definitely recommend this reactor to anybody.
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Superb design co2 reactor.
High quality reactor, BIG:). Very good performance and minimal loss of flow from my pressure pump on ADA Superjet filter. GLA quality is present in this reactor and much improved from the previous acrylic design. Which, in fairness was a good design but was smaller and diminished flow and pressure. From a technical standpoint these two points are critical for a good working reactor. Very pleased thus far and only been in service for one day, but I see it’s working quite well. Impressive reactor by GLA.
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Huge improvement with the new reactor.
Hooked it up this morning after removing my older GLA acrylic reactor and what an upgrade! First, the .45* elbow is a game changer compared to the old 90* elbow. My flow going into the reactor is stronger and I have more pressure building up within the reactor. It’s been about 6hrs now and it’s been awesome. With the old acrylic reactor by now I’d have a gigantic gas pocket. Right now I have a negligible gas pocket which I totally expect. But I’m guessing the larger volume and increased flow and pressure are helping a ton here. We will see how the next few days fair, but for now it’s absolutely awesome.
