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Old 05-20-2018, 07:54 PM   #8
Maerin
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The loop may be aspirating air from the vent. As the water flows past the fitting for the vented loop, it creates a venturi and the pressure drop is creating enough of a vacuum to pull air through the duckbill. That would be my guess. A change in the pump volume or pressure could have an effect on that. I'd look for a strainer/inlet obstruction, particularly if this just started. Does it stop if you temporarily block the air inlet to the loop vent? If the answer is yes, then that's the cause of the noise. Remedy is a different story.
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