Chihiros External Diffuser L

yorgunsair

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Aug 23, 2025
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Hello, I'm using the Chihiros External Diffuser L, and a few days ago, when I tried to remove it, the parts separated. I wasn't sure how to attach parts 1 and 2. Specifically, which way should I attach part 2 to part 1? I've added two pictures, A and B, to help you understand the directions. How do you think I should attach it? Like picture A or B?
 

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@Administrator
I can't see any CO2 bubbles in the ceramic part of the diffuser. I thought there was a problem with the hose coming from the CO2 tank, so I placed it in a container of water and saw bubbles appear. Also, the indicator in the aquarium doesn't turn green. I have two Chihiros diffusers and I tried them both, and unfortunately, the result was the same. Shouldn't bubbles normally appear in the ceramic part of the diffuser?
 

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Last edited:
How much bubbles are recommended for that diffuzor to start working?
Pressure Requirement:
The Chihiros External CO₂ Diffuser requires a minimum pressure of 0.15 MPa (1.5 bar / approximately 21.8 psi) to properly drive the ceramic diffuser head.
Bubble Rate Recommendation:
Start with a bubble rate of 1 bubble per second (1 bps) as a baseline. Then, gradually adjust to 2–4 bps or higher depending on:
● The size of your aquarium
● The density and type of aquatic plants
● Lighting intensity
● CO₂ demand
● Observed plant response and presence of excess CO₂ bubbles in the tank
 
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