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GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor

37 reviews Write a Review
$149.99
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
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GLA-CO2-REACTOR
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GLA PRO-CO2 Reactor 5L - Nature Aquarium CO2 Reactor
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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

37 reviews

  • 5

    This is much better than a diffuser.

    Posted by Nicole Burstrom on 3rd Aug 2025

    I’ve been very pleased with this reactor. There is a lot to learn when using a reactor. Without the educational support of GLA I would not have known I was doing everything wrong, or mostly wrong. This has my co2 levels extremely stable now that I’m properly set up. My plants now pearl like crazy and trimming is now the focus of attention on my aquascapes. I came today to buy another one for another aquascape using a regular diffuser. The folks at GLA are extremely nice and helpful beyond measure. They treat you like a family member which is rare this day and age. Shout out to Brian for all the help you offered me along my journey.

  • 5

    Big boy co2 reactor!

    Posted by Jamie Bush on 29th Jul 2025

    Even though I measured I was impressed when it arrived. The volume is nice and big. It has no issue handling my 160g tank with high levels of co2. Took me approximately 3 days to dial in with a ph controller and is now fully automated. Apex controller shows co2 levels are super stable 24/7. Worth every penny and really good quality craftsmanship.

  • 5

    This is an absolute unit!

    Posted by Ryan Rockwell on 27th Jul 2025

    Much bigger than anticipated. Hooked up to a Fluval FX using tubing adapters on the inside of the fluval tubing and hose clamps. Works fantastic! Took me two days to get my drop checker into the yellow with about a 1.5 drop in ph. Super pumped on this reactor, especially the lack of visible co2 bubbles.

  • 5

    Co2 reactor

    Posted by Eddie on 7th Jul 2025

    This was the very best CO2 management tool ever created for the planted tank hobby. It dissolves the CO2 with such precision and purity that it would be hard to imagine there being anything else out there that can beat it. I’ve never minded diffusers or the bubbles but the CO2 fluctuated. This unit even after the CO2 regulator shuts down is still holding and dissolving CO2 through the night. Just gradually keeping the aquarium stable. Whom ever designed it “ Nailed it “!!!!!!!

  • 5

    This co2 reactor works!

    Posted by Kyle Rifkin on 1st Jul 2025

    Have had this hooked up to my Fluval FX for about a week. It took my a few days to get my co2 levels dialed because I was moving slow, but man does this work extremely well. Plants are super pearly by mid day. Zero complaints!

  • 5

    GLA products

    Posted by Eddie on 16th Jun 2025

    There many companies out there to chose from but not like GLA. I purchased everything for my planted tank from them and the quality is spot on. The support team is super cool and stay with you till they know your set. Thanks GLA.

  • 5

    They should call this the co2 blaster 1000

    Posted by Jacob Smith on 9th Jun 2025

    This thing works! It’s a true beast of a co2 reactor and works flawlessly. Pro tip: This isn’t a diffuser and works on different principals so if you’ve never used one have GLA free tech support help you adjust your system. GLA was absolutely stellar with customer support. They helped me tune my aquascape gas exchange and now my plants are growing before my eyes, literally! The pearling I get now is just unreal and a sight to see. This co2 reactor is worth every penny.

  • 5

    My diffusion is at level 1000 now!

    Posted by Kenneth Alvarez on 2nd Jun 2025

    Took a few days to get completely dialed in, but holy crap pearling plants! Using an in-tank diffuser prior I got minimal pearling. But now, some of my plants started floating to the top they were so bubbly! Never in my life would I have ever considered a reactor until seeing one of these at my LFS. I’ll never go back to an in-tank diffuser this thing is incredible.

  • 5

    An absolute unit.

    Posted by Blake Jameson on 31st May 2025

    Wasn’t really sure how big it was going to be. It’s huge lol. But not only that it’s extremely well made, very high quality and works exactly as it should. Really cool, came with 3 sets of hose connections and even scroll of Teflon tape and some gaskets. 10 out of 10 from me!

  • 5

    This reactor is super nice.

    Posted by Felix Hernandez on 23rd May 2025

    Wasn't expecting this when I opened the box. Very nice size and quality craftsmanship. For my 90g its working flawlessly. If you are looking for a profesional grade co2 reactor, this is it.

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