Inline CO2 Diffuser with Nano Mist Membrane, Bubble Counter & Check Valve – 12/16mm Hose

The Castle Dawn Aquatics Inline CO2 Diffuser offers a professional-grade solution for optimising CO₂ delivery in planted aquariums. Using nano mist membrane technology, it produces ultra-fine bubbles for maximum saturation, improving CO₂ absorption and enhancing plant growth. Mounted inline to your filter hose, it keeps equipment out of sight for a cleaner aquarium aesthetic.

Crafted with a durable metal body and clear acrylic bubble counter, this diffuser includes a replaceable ceramic disc, a built-in check valve, and an anti-lock mechanism to ensure safe, consistent performance. Designed for 12/16mm (1/2” or 5/8”) hoses, it requires a pressurised CO₂ system with a working pressure of at least 30 psi.

Key Features and Important Notes:

• What’s Included:
  – 1 × Inline CO2 Diffuser with Bubble Counter
  ⚠️ Tubing and CO₂ system not included.
• Nano Mist Technology:
  Special membrane produces microbubbles that dissolve quickly into the water.
• Professional Performance:
  Requires minimum 30 psi working pressure for effective diffusion.
• Replaceable Disc:
  Ceramic membrane can be replaced for long-term use and fine mist output.
• Durable Construction:
  Crack-resistant metal body and acrylic bubble counter built for reliability.
• External Mounting:
  Reduces algae growth on the disc and keeps equipment out of your display tank.
• Built-in Features:
  Includes a check valve and bubble counter to simplify CO₂ management.
• Hose Compatibility:
  Fits standard 1/2” (12mm) and 5/8” (16mm) filter tubing.
• Size:
  12 × 6.5 × 2.5 cm (H × L × W)
  4.72 × 2.56 × 0.98 inches
• Warranty:
  1‑Year Warranty (T&Cs apply)
• ⚠️ Important Notes:
  – Only use with CO₂ pressure-rated tubing (not silicone).
  – Bubble counter must be filled with water, not oil-based fluids.
  – Minimum pressure: 30 psi.
  – Not suitable for low-pressure DIY CO₂ systems.
• ⚠️ Warning: Beware of cheap CO₂ accessories sold on major e-commerce platforms. Many lack proper build quality and can pose risks. Check our blog for more on manufacturing differences in aquarium gear.