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Pic of sump? More than likely coming from skimmer. Is it a new skimmer?
 

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Do you see them in the sump or are they being created by cavitation in the return pump?
 

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This might sound off the wall,but if your return pump is plumbed externally to your sump,rather than through a bulk head through the side of it,check and see if anything is blocking or restricting the flow.........Also on the suction side of where the return sucks from look with a flashlight for the vortex of death..Think drain on a bathtub....LOL
 

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You said you have different devices hooked up to your sump or actually pouring or moving water in your sump,,Have you tried to turn off or unplug each one individually...Might sound crazy....How low is your water level in your sump,many sumps that I have seen with low or shallow water levels have micro bubbles.....
 
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