Seachem Inline Diffuser
The glass Inline Diffuser is a pollen-style inline CO2 diffuser that is placed in the outflow line of the filter or aquarium pump to efficiently diffuse CO2 gas into the aquarium. This placement avoids the need for a diffuser inside the tank, significantly reducing the visibility of CO2 equipment.
Key benefits:
- Minimizes the visibility of CO2 equipment in the aquarium
- Ensures maximum dissolution of CO2 in aquarium water
- Allows for more consistent dosing of CO2
Compatibility
| Hose Diameter | Model |
|---|---|
| 12 mm ID / 16 mm OD | 13 mm model |
| 16 mm ID / 22 mm OD | 17 mm model |
FAQ
What is the purpose of the Seachem Inline Diffuser?
The Inline Diffuser is designed to diffuse CO<sub>2</sub> gas into aquarium water through the outflow line of a filter or pump, improving gas dissolution and ensuring consistent dosing without placing equipment directly in the tank.
Which hose sizes is the diffuser compatible with?
The diffuser is compatible with 12 mm ID/16 mm OD hoses (13 mm model) and 16 mm ID/22 mm OD hoses (17 mm model).
Does the diffuser require any special installation?
No special installation is required. Simply insert the diffuser into the outflow line of your filter or aquarium pump and secure it in place.




Alan Bond –
I installed the Inline Diffuser in my filter outflow and noticed a much cleaner tank appearance. The CO2 dosing is now more stable, and my plants are growing better. Easy to install and fits perfectly with my 16 mm hose.
Ava Piper –
The diffuser works well with my existing setup. I appreciate that it keeps the CO2 equipment out of the tank. The glass construction looks clean and the gas diffusion is consistent.
Sally Coleman –
After switching to the inline model, I no longer see any visible CO2 lines in the tank. The plants have responded positively, and the dosing has become more even over time.