£35.99
UP Inline Atomizer CO2 Diffuser - for 12/16mm HoseKey Facts
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Suitable for 12mm/16mm tubing (12mm internal / 16mm external). Click here for tubing size advice
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For aquariums up to 500L.
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Creates a mist of very fine bubbles.
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Excellent diffusion rates due to high surface area of small bubbles.
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Bubbles are in the flow of water as it enters the aquarium, so remain in suspension in the water for longer.
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Diffuser is located outside the aquarium which allows for easy maintenance.
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No equipment in the aquarium itself.
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Choose the size for your filter tubing.
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Requires 2 bar / 30 PSI pressure to function (provided by all CO2 Supermarket regulators).
Description
The inline CO2 Atomizer is arguably the most well known product used for CO2 diffusion, and is a firm favourite with planted aquarium specialists around the world. Designed for use with various filter size tubing, this CO2 diffuser sits inline between your filter and the filter outlet, ensuring that the CO2 has as much contact time with the water as possible. As a result, this atomizer dissolves CO2 very efficiently, and provides a stream of very tiny bubbles which exit directly out of your filter outlet. Furthermore, because it is kept outside the aquarium, maintenance is a very easy.
To use this CO2 atomizer, simply connect it, in-line, to your external filter outlet pipe and tighten the nuts. Connect your CO2 regulator to the atomizers CO2 input with air hose tubing and tighten the safety nut. The tiny bubbles that the atomizer produces will then spread evenly around the whole tank, ensuring a uniform spread of CO2.
To use this CO2 atomizer, simply connect it, in-line, to your external filter outlet pipe and tighten the nuts. Connect your CO2 regulator to the atomizers CO2 input with air hose tubing and tighten the safety nut. The tiny bubbles that the atomizer produces will then spread evenly around the whole tank, ensuring a uniform spread of CO2.
Instructions
- Inline atomizers are to be installed on the return / outflow tubing from a filter as the water is reintroduced to the aquarium.
- Cut or replace your filter tubing with PVC tubing.
- Push tubing on to each end of the diffuser.
- Screw the retaining nuts back over the tubing to hold in place.
- Unscrew the small nut on the CO2 inlet.
- Feed CO2 tubing through the nut and onto the CO2 inlet.
- Tighten the nut onto the CO2 inlet to secure the tubing.
- Turn CO2 on, allow pressure to build within the diffser.
- Adjust dosing / bubble rate accordingly.
Customer Reviews
Average Rating
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If Q.
18th Aug 2025Honestly, I love this one. I use it in a nano tank which is equipped with a Eheim Experience 150. The CO2 mist produced by this is so small, for a split second, i thought it was not working. Since I have a nano tank, not having a diffuser in tank really helps. Honestly, I love this one. I use it in a nano tank which is equipped with a Eheim Experience 150. The CO2 mist produced by this is so small, for a split second, i thought it was not working. Since I have a nano tank, not having a diffuser in tank really helps. -
Keith L.
4th Aug 2025No problems or complaints, works just like it should No problems or complaints, works just like it should -
Giles A.
26th Jul 2025No issues after months of use. Recommend. No issues after months of use. Recommend. -
Ray W.
22nd Jul 2025Great diffuser! Produces a really fine mist of CO2! Great diffuser! Produces a really fine mist of CO2! -
Simon M.
22nd Jun 2025Good diffuser and great way to keep equipment out of the tank.. Produces a fine mist. You'll need decent pressure 40+PSI to get it working properly. Good diffuser and great way to keep equipment out of the tank.. Produces a fine mist. You'll need decent pressure 40+PSI to get it working properly. -
Paul P.
31st Oct 2024It produces a super fine mist of bubbles, so you barely notice them, and it doesn't clutter up the tank It produces a super fine mist of bubbles, so you barely notice them, and it doesn't clutter up the tank -
John W.
21st Jul 2024Working very well,but does require a lot of pressure. Working very well,but does require a lot of pressure. -
Kyle G.
10th Oct 2023Makes really small bubbles and I prefer having as much equipment out of the tank as possible so this is a great solution for that. Makes really small bubbles and I prefer having as much equipment out of the tank as possible so this is a great solution for that. -
Matt W.
21st Jan 2021Really nice piece of equipment Really nice piece of equipment -
David S.
19th Sep 2020Diffuses gasses well. Easy enough to clean. All good. Diffuses gasses well. Easy enough to clean. All good.
