Pond Boss Forums AERATION Systems questions Bottom diffusers

I just had a thought. Pull the diffuser and base up out of the pond. Have someone on shore when you do this. Unscrew the diffuser membrane from the base and with it pointed away from you have the person on shore turn on the compressor. If no air is coming out you know the line is the problem. I DID have one Vertex diffuser that had the check valve stick internally and it wouldn't let out more than a few small bubbles.

What brand diffuser?

Another time the diffuser quit making bubbles on a different system. The owner put a boat hoist over the line and it sunk into the bottom of the lake, effectively pinching the line shut. I just cut the line at the hoist and ran a new piece of line to the airstation.