Seachem Glass Inline Diffuser 13mm

Crystal-Clear CO₂ Diffusion for a Cleaner Aquascape

The Seachem Glass Inline Diffuser 13mm is designed to deliver highly efficient CO₂ dissolution while keeping all equipment outside the aquarium, preserving a clean, unobstructed aquascape. Installed directly on your filter’s outflow line, it maximizes CO₂ solubility and creates stable CO₂ levels for healthier plant growth.

Key Features

• Minimises visible equipment inside the aquarium
• Highly efficient pollen-style CO₂ diffusion
• Promotes consistent CO₂ levels and reduces waste
• Installs on the outflow line of your canister filter or pump
• Compatible with 12 mm ID / 16 mm OD hoses
• Works with 6 mm (1/4") CO₂ airline tubing
• Includes suction cups for secure mounting

Product Description

The 13 mm Seachem Glass Inline Diffuser is placed externally along your filter’s outflow hose, allowing CO₂ to dissolve rapidly into the water column before returning to the aquarium. This setup removes the need for in-tank diffusers, making CO₂ injection almost invisible while improving efficiency.

This inline method ensures:

• Faster CO₂ dissolution
• More consistent injection rates
• Reduced CO₂ loss or overdosing
• A cleaner, simplified aquascape layout

Compatible with 12/16 mm filter hoses and standard 6 mm airline tubing.

Directions

1. Rinse glassware with warm water before use.
2. Cut your 12/16 mm filter hose to position the diffuser vertically next to the aquarium.
3. Attach the hose so the diffuser disc faces upward toward the outflow.
4. Add suction cups and connect 6 mm airline tubing to the CO₂ input.
5. Install a check valve (not included) on the CO₂ line.
6. Wet the inside of the hose/tubing and slide onto the glass—never use lubricants.
7. To remove tubing, cut it rather than pulling to avoid breakage.
8. Mount the diffuser using suction cups, ensuring vertical placement.
9. Turn on the filter and confirm water flow without leaks.
10. Activate CO₂ and adjust the bubble rate with your bubble counter (not included).

What’s Included

• 1 × Seachem Glass Inline Diffuser (13 mm)
• Suction cups

Technical Specifications