StOrEcRaFt wrote:

I couldn't see where the air was
exiting the pond but I don't care because I know the pump provides a
positive air flow.

Not necessarily. Pumps provide pressure. If the pressure rises too
high, it indicates the air flow has stopped. All good pumps come with a
chart showing air flow versus pressure. This way, if you have a pressure
gauge, you can tell your air flow by looking it up on the chart.
--
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA