Air stone Tetra AS 40 for aquarium aeration, compatible with Tetra APS air pumps

Tetra AS 40 is an air stone for aquarium aeration that produces a fine, even stream of bubbles to improve oxygen transfer and water circulation. Designed for use in freshwater and planted tanks, the air stone connects to standard airline tubing and is compatible with Tetra APS air pumps. Its fine-porous structure promotes efficient gas exchange at the water surface while maintaining low back pressure on the pump.

Advantages

The fine-pored construction ensures uniform bubble size and full utilisation of pump output with minimal pressure resistance. Manufactured from durable materials, the air stone resists clogging and maintains performance over extended periods. Compatibility with common airline tubing and Tetra APS air pumps allows easy integration into existing aquarium setups.

Suitable for

• Aeration and oxygenation of freshwater aquariums
• Surface agitation to improve gas exchange
• Supporting biological filtration by enhancing water movement
• Planted tanks where gentle circulation is required

Key specifications

• Fine-pored design for uniform, small bubble output
• Low pressure resistance to maximise air pump performance
• Durable, clog-resistant construction
• Connects to standard 4–6 mm airline tubing
• Suitable for freshwater and planted aquarium environments

How to use

Connect the air stone to standard airline tubing and attach the tubing to a compatible air pump. Position the air stone at the desired location on the aquarium substrate or secure it with tubing clips so bubbles rise freely. Use a check valve or air control valve in the line if required to regulate airflow or prevent backflow. Periodically inspect the air stone for reduced bubble output and clean or replace it if performance declines.

Usage recommendations

For consistent performance, operate the air stone with an air pump sized appropriately for the tank volume; regular gentle cleaning will extend service life. Avoid placing the air stone directly against large decorative items or dense plant growth that may block bubble dispersion.