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Green Leaf Aquariums is a leading planted aquarium brand with 20 years industry expertise in: professional lifetime aquarium CO2 systems, the finest quality aquarium plant fertilizers, thriving aquarium plants & tissue cultures, and specializing in custom hardscape design

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GLA Aquarium CO2 Reactor 16/22mm

(14 reviews) Write a Review
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External CO2 reactor for high efficiency CO2 dissolution by internal whirlpool waterflow, allowing 100% CO2 dissolution in aquarium water. Made of highest quality food grade materials.

  • mount outside aquarium tank, inline within outflow tubing of canister filter

  • fits tubing size 16/22mm ID/OD (inside diameter /outside diameter)
  • height: 15 inches (375mm)
  • diameter: 4.5 inches (116mm)
  • volume: 2.5 liters

14 Reviews Hide Reviews Show Reviews

  • 5
    Excellent aquarium co2 reactor.

    Posted by Jesse Armstrong on 25th Jul 2021

    I went from a DIY PVC reactor to this beast and what a difference. Its much larger than I thought it would be but its perfect. It comes with a check valve a small section of connecting tubing. You will need your own co2 tubing. Otherwise I love it, and the cool stickers that came with it!

  • 5
    Much larger than anticipated and works like a dream.

    Posted by Niles D. on 26th Jun 2021

    I was unsure what method of diffusion to use so I phones GLA via text and they helped me narrow things down to an inline co2 reactor. my tank is crystal clear now, no more foggy mist from the ceramic diffuser. I love the fact I dont have to clean it if I dont want to so my co2 levels are always on point 24/7 in my 90g.

  • 5
    Much better than my old co2 reactor.

    Posted by Jose Quinones on 9th Jun 2021

    I ordered this to replace an older reactor that could not be cleaned. The GLA co2 reactor is massive in diameter so you can clean it in seconds easily. During operation this thing functions flawlessly.

  • 5
    Very happy

    Posted by Reggie Williamson on 5th Jun 2021

    I love this reactor and it does exactly what a reactor should do. I learned a lot from GLA on how to properly dial in diffusion per the light levels in the tank. All while considering off gassing/surface agitation. Excellent co2 reactor!

  • 5
    Exactly what your looking for.

    Posted by Jeff Jansen on 29th Mar 2021

    Easy to set up and maximize your co2. Keeps the equipment out of your tank.

  • 5

    Posted by Rebecca A. on 9th Feb 2021

    I love this reactor. Very well made and could not be easier to install. I like that I dont have to clean my diffuser any longer, one less thing to do. It works just as intended. Totally saturates my co2 in seconds. The cool whirlpool motion has my cat mesmerized. The reactor is quite large, much larger than I anticipated only because I compare it to my previous reactor which appeared to be a DIY type reactor from another vendor. I reached out to GLA to have my reactor custom fit with two different hose barbs. If you need one for a 2217 filter they got you covered. Sweet co2 reactor no doubt.

  • 5
    Extremely happy

    Posted by Kyle Strom on 6th Feb 2021

    This reactor has been perfect since day one. Ive had it over a little over a year now. I can now see crystal clear water and have perfect co2 levels all day. It does take some getting use to if you new to using a reactor vs a co2 atomizer. One thing to note, reactors will use more co2 than an atomizer. This is to be expected because your aquariums water surface is an instant escape membrane for co2 to leave solution instantly. Whereas an atomizer keeps co2 mist in the tank for the most parts and the tiny bubble stick to the leaves and plants which they love. This is why atomizers use less co2 in most aquarium settings. I have the 16/22mm on my 75g tank and the 12/16 on a 55g and both use about the same amount of co2. cant wait to set up my new 125 with another 16/22:)

  • 5
    Perfect fit

    Posted by Glenn W. on 18th Jan 2021

    This reactor works perfect, and fits my cabinet really well because it stands on its own. It has my co2 saturated 100% and you barely have to do anything lol. It came with easy to follow Ikea style instructions, so if you have trouble its nobody fault but your own. Its a little expensive but the customer service and the whole experience was just super pleasant. The guys at GLA are stellar, and are always on tap to help. These guys are legit Co2 pro's. Not some posers like the rest of the stuff you see.

  • 5
    CO2 reactor

    Posted by Long on 19th Apr 2020

    I just set a new tank got an additional manifold block. I want to try out the co2 reactor. I read a lot about how efficient the co2 reactor is. I wanted to give it a try. I like the fact that the reactor is very big and stand on it's own. I added a small pump to the reactor. I ran the return hose line into the sump pump. The first few hours the water is swirling inside the reactor. So it makes a lot of noise. Once the reactor filled up. There is absolutely no noise. On the positive side to the reactor. You don't have to see the tiny bubbles floating all over the tank. You don't have to maintain it like you have to with the atomizer. I have been running it for a few weeks now.

  • 5
    Very Happy

    Posted by Jason Short on 12th Feb 2020

    Excellent build quality and easy to follow instructions. It takes all of 3 minutes to install. This co2 reactor is much larger than any other reactor I have ever seen or used. Perhaps thats why it works so well. The way the whirlpool motion happens inside the co2 reactor is quite cool. This is what gets the co2 100% saturated. I run a fairly high bubble rate on my 180g tank and this reactor has no issue handling this tank. I will be buying another one as soon as my tank arrives next week. Very happy!

  • 5
    Outstanding co2 reactor

    Posted by Terry Williams on 18th Jan 2020

    I purchased this reactor to go with my Pro-DS co2 regulator. I really like this reactor because it keeps co2 stable in my 180g tank. My previous co2 reactor was simply to small to handle the co2 going into it. Simple installation and very cool whirlpool effect it creates inside. It also looks cool unlike the rest you will see on the interwebs:) Very high quality unit.

  • 5
    Excellent co2 reactor.

    Posted by Eva Simons on 15th Jan 2020

    This is my first time using a co2 reactor so I dont have any other reactor to compare it to. However I was using a ceramic style co2 diffuser and I was not fond of the constant cleaning or the bubbles flying all around. This reactor totally saturates the co2 prior to going into your aquarium. I dont see not a single bubble exiting the reactor. I like the cool whirlpool effect it creates and Im guessing this motion is what saturates the water with co2. Installation is really easy and the instruction diagram was great, although not really needed because the its pretty straight forward. Cant wait to see my plants take off now! They are already pearling after only 1hr of using the co2 reactor. Gotta love that!

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