Tiny Bubbles in my return

[Grahamdesign]

I recently replaced on old blueline 55 pump for a new one and now I am getting hundreds of tiny bubbles in the return. I turned off the skimmer and chiller to see if they were the cause and they still kept coming. Any suggestions?

[Elegance Coral]

Do you have part of the discharge from the pump plumbed back into the return section of the sump? If so, you probably have a small leak on the intake side of the pump.