Quote:
Originally posted by MadDogMe
I do have a reservoir, it's 'sealed/airtight' with airspace in the top 1/10, though I had the same noise/affect when the res' never had the lid on. I have a head of no more than 8inches...
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Is your pump suction line connected to the reservoir? If so, that should keep the closed loop from starving flow to the pump. What components does your cooling loop consist of besides the Eheim?
I agree with Rascal, I don't think the Eheim (or any pond pump) can generate the required low pressure for true cavitation (at normal room temps). A lot of what we call cavitation, I beleive is the impeller rattling/vibrating on the shaft. I have heard of people glueing their impellers onto the shaft to stop this noise. I have not experienced it with any of my pumps.