Chihiros External CO2 Diffuser

The Chihiros External CO₂ Diffuser is a high-performance inline diffuser engineered to deliver superior CO₂ distribution in planted aquariums—without cluttering your tank. Made from a robust combination of aluminum, acrylic, and ceramic, this diffuser guarantees both durability and optimal CO₂ atomization for lush aquatic plant growth.

Designed to connect directly to your filter’s outlet hose, it sits discreetly outside the tank, preserving the clean lines of your aquascape. The precision-fired ceramic disc produces an ultra-fine mist, ensuring efficient CO₂ saturation throughout your aquarium. With a minimum working pressure of 1.5 bar (0.15 MPa), it’s ideal for setups that demand both power and precision.

Maintenance is simple thanks to the replaceable diffuser head, making it a long-lasting solution for serious aquascapers.

Key Features:

• External Inline Design – Keeps your aquarium free from visible internal gear

• Durable Construction – Made from premium aluminum, acrylic, and ceramic

• Fine Mist Atomization – High-efficiency ceramic disc delivers consistent CO₂ diffusion

• High Pressure Performance – Requires a minimum of 1.5 bar (0.15 MPa) for optimal results

• Easy Maintenance – Replaceable ceramic head extends product life

• Tool-Free Installation – Connects effortlessly to your filter’s outlet hose

• Two Size Options – Compatible with standard hose sizes

Available Sizes:

• M Size – For 12/16 mm (13 mm) hose

  • Height: 120 mm

  • Diameter: 30 mm

• L Size – For 16/22 mm (17 mm) hose

  • Height: 130 mm

  • Diameter: 30 mm

View our other Chihiros products here.

Learn about CO2 here: