"~ jan JJsPond.us" wrote in message
...
BV, not sure why you're hearing air, perhaps it was just the water level
equalizing in the pipe after the pump was turned off? Regarding your
drawing though, how are you aerating your pond? Most of us have our
returns
above water level, if not flowing down streams and waterfalls. ~ jan

Jan, right now I am not aerating aside from stirring the water periodically
when I do water changes. I tend to splash the water a lot then. I also
periodically allow the pump to just shoot water up in the air. This weekend,
I will either be adding a water feature or an air stone. It depends on my
time. I know I need aeration, just trying to decide method.

BV.