The Chihiros External CO Diffuser is a high-efficiency inline atomizer designed to inject CO directly into your canister filter outflow. By diffusing gas within the return hose, it maximises contact time and ensures superior CO dissolutionresulting in stable levels and optimal plant growth without visible equipment inside the tank.
Key Features
Inline CO Injection (Maximum Efficiency)
Installs directly onto your filter return hose, allowing CO to mix thoroughly before entering the aquarium for improved absorption.
Ultra-Fine Ceramic Diffusion
Integrated ceramic disc breaks CO into micro-bubbles, creating a fine mist that dissolves quickly and efficiently.
Cleaner, Equipment-Free Aquascape
External installation keeps your tank free of glass diffusers and clutterideal for display aquariums and aquascaping.
High CO Efficiency & Stability
Longer contact time in the hose improves gas utilisation and helps maintain consistent CO levelseven in demanding planted tanks.
Durable Acrylic & Ceramic Build
Constructed from high-quality acrylic with a replaceable ceramic diffusion plate for long-term reliability.
Silent Operation
Operates quietly within the filtration system, with no visible bubbles or noise inside the aquarium.
Variants Available
- M 12/16mm Hose
Ideal for small to medium aquariums and standard canister filters - L 16/22mm Hose
Designed for larger tanks and higher flow filtration systems
(Always match the diffuser size exactly to your hose size to prevent leaks)
Specifications
- Type: Inline CO diffuser (external)
- Material: Acrylic body + ceramic diffusion disc
- Installation: Filter return hose (outflow side)
- Working Pressure: ±1.5 bar recommended
- Compatibility: Pressurised CO systems with regulator
- Sizes:
Ideal For
- High-tech planted aquariums
- Aquascaping display tanks
- Canister filter systems
- Hobbyists wanting hidden CO equipment
- Medium to large aquarium setups
Why Choose an External CO Diffuser?
Compared to in-tank diffusers, external (inline) diffusers provide better efficiency, cleaner aesthetics, and more stable CO levels. By dissolving CO before it enters the tank, you reduce visible bubbles and improve overall distributionmaking it the preferred choice for serious aquascapers.
Quick Size Guide
- Running 12/16mm hoses (e.g. smaller Oase, Sunsun, etc.) Choose M
- Running 16/22mm hoses (e.g. larger canister filters) Choose L
