Rectangular Air Stone Bar Diffuser = AWB / ACB Series - 2 Pack

The Castle Dawn Aquatics Rectangular Air Stone Bar Diffuser (AWB / ACB Series) is an effective and reliable way to increase oxygen levels in your aquarium, DWC system, or koi pond. Each stone bar is designed to produce two distinct bubble effects depending on air input—fine bubbles under low pressure, and medium bubbles under high pressure, forming a mesmerising rectangular curtain of bubbles that not only aerates but also enhances your aquatic display.

Made with compressed sand and a durable plastic base, these bars are safe for all aquatic life. Every unit comes with a suction cup clip for secure positioning, keeping the diffuser steady at the bottom of your tank or bucket without floating. Available in three sizes to suit various aquarium types and setups.

Key Features and Important Notes:

• What’s Included (per pack):
  – AWB-100: 2 × 10 cm air stone bars with suction cup clips
  – AWB-200: 2 × 20 cm air stone bars with suction cup clips
  – ACB-300: 2 × 30 cm air stone bars with suction cup clips
• Bubble Output: Two bubble modes – fine bubbles with low airflow, medium bubbles with higher airflow.
• Visual Effect: Creates a rectangular bubble wall – great for display tanks and oxygen distribution.
• Airline Compatibility: Fits standard 0.5 cm (4 mm ID) airline tubing.
• Jetting Volume & Recommended Pump Power:
  – AWB-100: 2.5 L/min | > 2 W air pump
  – AWB-200: 10 L/min | > 4 W air pump
  – ACB-300: 17 L/min | > 7 W air pump
• Dimensions & Weight:
  – AWB-100: Size: 3.8 × 10 × 2 cm (H × L × W) – 1.5 × 3.94 × 0.79 in | Weight: 34 g
  – AWB-200: Size: 3.8 × 20 × 2 cm – 1.5 × 7.87 × 0.79 in | Weight: 76 g
  – ACB-300: Size: 3.8 × 30 × 2 cm – 1.5 × 11.81 × 0.79 in | Weight: 113 g
• Material: Compressed sand core with plastic base – safe for all aquatic life.
• Use Case: Ideal for aquariums, deep water culture (DWC), fish tanks, and koi ponds.
• Installation: Suction cup clip included – keeps diffuser stable at the tank bottom.
• Maintenance: Soak for 1 hour before first use. Clean regularly with a brush to prevent clogging.
• Warranty: 1‑Year Warranty (T&Cs apply).