UNS Inline CO2 Diffuser

UNS Inline CO2 Diffuser

  • Inline CO2 diffuser for installation in filter hose
  • Efficient CO2 dissolution in the filter circuit
  • Very fine CO2 bubbles via ceramic membrane
  • Transparent diffusion chamber for CO2 flow monitoring
  • Suitable for external filter systems
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Description

The UNS Inline CO2 Diffuser enables particularly efficient and discreet CO2 diffusion in planted aquariums. It is integrated directly into the filter hose of an external filter and dissolves the supplied CO2 in the flowing water. This means the gas is finely atomised within the filter circuit and distributed optimally throughout the aquarium.

Thanks to the inline installation outside the aquarium, the layout inside the tank remains free from visible equipment. The microbubbles produced dissolve quickly in the water, resulting in a highly efficient CO2 supply for aquatic plants. At the same time, visible CO2 bubbles in the aquarium are significantly reduced.

The housing is made of high-quality aluminium and features a transparent diffusion chamber for easy monitoring of the CO2 supply. An integrated ceramic membrane ensures particularly fine atomisation of the CO2. The diffuser can be integrated easily into existing CO2 systems and is ideal for aquascaping aquariums and heavily planted layouts.

Features

  • Inline CO2 diffuser for installation in the filter hose
  • Efficient CO2 dissolution in the filter circuit
  • Very fine CO2 microbubbles
  • No visible equipment inside the aquarium
  • High-quality aluminium housing
  • Transparent diffusion chamber for monitoring the CO2 supply
  • Ceramic membrane for fine CO2 atomisation
  • Compact design
  • Easy integration into existing CO2 systems

Application

The diffuser is installed in the return hose of an external filter. CO2 is fed into the diffusion chamber via a hose connection and finely atomised there through a ceramic membrane. The CO2-enriched water is then returned to the aquarium through the filter outlet.

Dimensions

UNS Inline CO2 Diffuser – 12/16 mm
Length 110 mm
Width 20 mm
Height 30 mm
UNS Inline CO2 Diffuser – 16/22 mm
Length 120 mm
Width 30 mm
Height 50 mm
UNS Inline CO2 Diffuser – 19/25 mm
Length 130 mm
Width 30 mm
Height 50 mm

Cleaning

For cleaning, the diffuser can be removed from the hose system. Limescale and algae deposits can be removed carefully using a suitable cleaning agent. Rinse thoroughly with water afterwards.

UNS

UNS

Ultum Nature Systems from the United States create first-class frameless aquariums and high-class accessories for aquarists who see aquascaping as more than just a hobby. The elegantly designed aquariums offer a fantastic basis for first-class aquascapes, natural aquariums, plant and holland-style tanks as well as saltwater or reef tanks, thanks to the very high-quality diamond glass. With aquascaping always as a reference level and the accompanying needs for space, depth and design freedom, UNS have an exceptionally well thought-out portfolio of different sizes in their range. The UNS range also includes high-class equipment. CO2 systems, LED aquarium lighting, substrate, fertiliser and stainless steel tools.

Manufacturer information

Manufacturer
Name ULTUM NATURE SYSTEMS, INC
Street River Ave Suite B 2623
City 626-215-3157 Rosemead
State Kalifornien
Country Vereinigte Staaten
E-mail sales@ultumnaturesystems.com
Website www.ultumnaturesystems.com

Responsible person
Name E.A. European aquaristics GmbH
Street Deichstraße 189
City 27804 Berne
State Niedersachsen
Country Deutschland
E-mail info@europeanaquaristics.com
Website europeanaquaristics.com

General information

Item no.
EAN
Weight
Shipping weight

Questions and answers about UNS - Inline CO2 Diffuser

You have questions about this product? Ask other customer or our support team about this product!

Does this inline diffuser also need a minimum pressure?
Translated from German
Alexander V.
Jun. 2026
Lisa Pogodda
Jul. 2026
Support
The actual performance, and with it the required minimum pressure, can vary depending on factors such as the condition and age of the ceramic membrane, deposits of organic or mineral residues, the configuration of the regulator and tubing lines, and the back pressure from the pump or canister filter. However, it reaches its optimal performance at around 2 bar / 29 PSI.
Translated from German
Helpful!
Hello Aquasabi team, I have a problem with the CO2 supply from my stainless steel membrane diffuser, and somehow the bubbles don't dissolve in the aquarium. We have hard water; the AI says an inline diffuser would be better. Is that true? Does the CO2 dissolve better with that?
Translated from German
Diana Schmidt
Aug. 2026
Sven Breitenbach
Aug. 2026
Support
The statement is partly correct. An inline diffuser usually produces finer bubbles, so CO2 dissolves better in the water. Water hardness plays no role here.
Translated from German
Helpful!
To what extent does the diffuser affect the flow rate in the tubing?
Translated from German
Adam N.
Sep. 2026
Jonas Breitzke
Sep. 2026
The diffuser affects the flow only to a limited extent, since the CO2 supply and membrane are arranged at the side and the water stream is led through largely straight. In principle, however, every additional component in the filter circuit creates a certain flow resistance, so a slight influence cannot be completely ruled out.
Translated from German
Helpful!

Customer reviews

This item has been rated 5 out of 5 stars
2 Reviews
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5 Stars(2)
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1 Star(0)
André K.
Great look
3rd June
UNS - Inline CO2 Diffuser - 16/22 mm
UNS - Inline CO2 Diffuser - 16/22 mm

The diffuser is really great and cleanly made, everything important is metal, it feels substantial in your hand. I was surprised that the bubbles were so coarse and easy to see. (read more)

Translated from German
Show original

Tolle Optik

Der Diffusor ist wirklich toll und sauber verarbeitet, alles wichtige ist aus Metall, man hat was in der Hand.

Habe mich darüber gewundert das die Blasen so grob und gut zu sehen waren.

Habe ihn an einem Hiwi Druckminderer und habe mit rund 1,7-1,8 Bar arbeitsdruck angefangen.

Die Lösung für schön feine Blasen war anders als bei anderen Diffusoren.

Für den UNS inline diffusor habe ich den Arbeitsdruck auf rund 1,5 Bar gesenkt, seit dem gibt's ordentlich feine Blasen.

Beim anbringen des Schlauch auf der Ausgangsseite muss man etwas aufpassen, man kann die Kappe mit Relativ wenig Kraft vom Schauglas schrauben, das Gewinde ist auch nicht lang.

Bin zufrieden mit dem UNS und mal abwarten was die Langzeit Erfahrung bringt

Fabian H.
Absolutely great! Recommended
18th May
UNS - Inline CO2 Diffuser - 16/22 mm
UNS - Inline CO2 Diffuser - 16/22 mm

I wanted to avoid equipment inside the tank, so I needed an inline diffuser for a moderate price - here clean looks meet great functionality. (read more)

Translated from German
Show original

Absolut super! Empfehlung

Ich habe auf Technik im Becken verzichten wollen, also musste ein Inline-Diffusor für moderates Geld her - hier trifft saubere Optik auf super Funktionalität.

Inbetriebnahme geht problemlos vonstatten, die Blasen könnten kaum feiner sein! Absolute Empfehlung.

Parallel habe ich einen Qanvee Diffusor zum Vergleich, dieser UNS Diffusor schneidet um Längen besser ab!

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