Inline CO2 Diffuser (19mm & 25mm) - Fluval FX

The Inline CO2 Diffuser (19mm & 25mm) is a professional-grade CO2 diffusion system designed specifically for large canister filters like the Fluval FX series. This inline diffuser provides superior CO2 dissolution directly into your filter's output line, ensuring maximum efficiency and even distribution throughout your planted aquarium without cluttering your aquascape with in-tank equipment.

Why Choose an Inline Diffuser?

Unlike traditional in-tank diffusers, inline CO2 diffusers connect directly to your canister filter's return line, utilizing the filter's powerful flow to break down CO2 bubbles into ultra-fine mist. This results in near-complete CO2 dissolution, better plant uptake, and a cleaner, more professional-looking aquarium without visible equipment.

Key Features:

• Two Size Options: 19mm and 25mm to fit various canister filter hose sizes
• Perfect for Fluval FX Filters - Designed to work seamlessly with FX series and other large canister filters
• High-Efficiency Diffusion - Ceramic membrane creates ultra-fine CO2 mist for maximum dissolution
• Invisible Installation - Keeps your aquascape clean without in-tank equipment
• Durable Construction - High-quality acrylic body with replaceable ceramic disc
• Easy Installation - Simply cut your return line and insert the diffuser
• Minimal Pressure Loss - Designed to maintain optimal filter flow
• Clear Acrylic Body - Monitor CO2 bubble flow and diffusion performance
• Universal Compatibility - Works with any CO2 system and most canister filters

Size Guide:

• 19mm (3/4") - For hoses with 16-19mm outer diameter (Fluval FX4, FX5, FX6, and similar)
• 25mm (1") - For hoses with 22-25mm outer diameter (larger FX models and commercial filters)

How It Works:

CO2 from your regulator enters the diffuser chamber where it's forced through a fine ceramic membrane. The powerful flow from your canister filter breaks the CO2 into microscopic bubbles that dissolve almost instantly into the water, providing efficient CO2 delivery throughout your entire aquarium.

What's Included:

• Inline CO2 diffuser (select your size)
• Ceramic diffusion disc
• Installation fittings
• Instructions

Perfect For: Large planted aquariums, high-tech setups, aquascaping tanks with Fluval FX or other powerful canister filters where maximum CO2 efficiency and clean aesthetics are priorities.

Upgrade your CO2 system with professional inline diffusion for superior plant growth and a cleaner aquascape.