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Bubbles in Main Tank, cavitation?

bubbles cavitation
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Bubbles in Main Tank, cavitation?

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I have a 180 gallon tank plumbed into the basement which dumps into a 300 gallon sump. The return line is 2″ pvc to a hammerhead pump which pumps a head of about 12′ in 1.5″ pvc to the tank. I am circulating about 3,500 gallons per hour from the sump. I also have a closed loop moving additional water within the tank with four returns. My issue is that I am having tiny bubbles returning from the sump to the main tank. The sump is very calm , tiny bubbles not visible and I have tried a return box with sponges to trap possible bubbles and multiple inlets to decrease the intake draw of water, nothing seems to decrease the bubbles. Can my powerful pump be chopping the water and creating air bubbles.

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