The Pro Air 20 and Pro Air 60 Pond Aeration Systems provide continuous aeration to support pond water quality and fish health. If the system produces weak airflow, fewer bubbles than normal, or no bubbles, inspect the compressor, check valves, airline tubing, and diffusers.
Always begin troubleshooting at the compressor and work toward the pond.
Step 1 – Check the compressor
- Check that the compressor is connected to a properly functioning GFCI-protected electrical outlet.
- If the compressor is not running, check whether the GFCI has tripped.
- Disconnect the compressor from power before disconnecting any airline tubing.
- Remove the airline tubing from the compressor outlet or manifold.
- With the outlet unobstructed, briefly power on the compressor and check for airflow.
- Disconnect power again before reconnecting the tubing.
Results:
- Strong airflow: Continue to Step 2.
- Weak or no airflow: Inspect the air inlet filter and consider possible diaphragm wear as described in Step 5.
Important: Keep the compressor dry and, whenever possible, positioned above the pond's water level.
Step 2 – Inspect the check valves
Check valves prevent pond water from flowing backward through the airline and entering the compressor.
- Disconnect power to the compressor.
- Locate the check valve installed in each airline.
- Verify that the valve allows airflow toward the diffuser.
- Correct the orientation if the valve is installed backward.
- Replace any damaged or blocked check valves.
The Pro Air 20 uses one check valve, while the Pro Air 60 uses two.
Important: Never operate the system without the required check valves. Water entering the compressor can cause permanent damage.
Step 3 – Inspect the airline tubing
Inspect the airline tubing between the compressor and each diffuser.
Look for:
- Kinked or pinched tubing
- Crushed or damaged sections
- Loose connections
- Blockages that restrict airflow
Straighten the tubing or replace damaged sections. Secure the tubing connections with the appropriate stainless steel hose clamps.
For the Pro Air 60, also inspect both outlets on the two-way manifold and verify that the airflow control valves are properly adjusted.
Step 4 – Inspect the diffusers
The Pro Air 20 uses one rubber membrane diffuser, while the Pro Air 60 uses two.
- Disconnect power to the compressor.
- Inspect the diffuser and connected airline for visible restrictions.
- Check the rubber membrane for accumulated debris or damage.
- Correct any restrictions before restarting the compressor.
- Reconnect the airline and verify that bubbles are being produced.
Important: If a kinked airline or obstructed diffuser significantly restricts airflow, shut down the compressor immediately to prevent overheating.
Step 5 – Inspect the air inlet filter and diaphragm
If airflow remains weak or absent, inspect the compressor's air inlet filter.
Air filter maintenance:
- Disconnect power.
- Remove the air inlet filter cover.
- Inspect the sponge filter for dirt or debris.
- Rinse the sponge in clean water if necessary.
- Allow the sponge to dry completely before reinstalling it.
- Replace the filter if it is damaged or excessively worn.
Check the air inlet filter at least annually and more frequently in dusty environments or if the compressor makes abnormal noises.
Possible diaphragm failure:
The compressor's internal rubber diaphragms can wear over time, resulting in reduced or no airflow. If the electrical supply, filter, tubing, check valves, and diffusers are functioning properly, diaphragm replacement may be necessary.
Use the replacement components designed for your specific model:
- Pro Air 20: Pro Air 20 Compressor Renew Kit, Item #61015
- Pro Air 60: Pro Air 60 Replacement Diaphragm, Item #61007
Step 6 – Verify system operation
After completing troubleshooting:
- Reconnect all airline tubing.
- Confirm that check valves face the correct direction.
- Secure all tubing connections.
- Confirm that the tubing and diffusers are free of restrictions.
- Restore power through the GFCI-protected outlet.
- Verify that the diffuser or diffusers produce consistent bubbles.
If airflow remains weak after these checks, the compressor may require additional repair or replacement.
For additional assistance, submit a request through the Aquascape Customer Care contact form.