Quote:
Originally Posted by slief
Try plugging the ozone port on the pump and see if it persists or connect tubing to the ozone port to see if pulling air in there helps. With the ozone port uncapped, you are pulling both air and water into the venturi chamber within the nozzle so capping the port off so it can’t draw water or adding tubing to the port so it can draw air could solve it as this could be the result of cavitation cause by both air and water entering the venturi chamber within the nozzle. Also, with that port open to draw water, you will get excessive salt creep in the venturi port where the silicone air tubing connects to the nozzle.
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I just tried both options that you suggested. I do not see a difference in the vibration noise. If I put my DC180 in the same sump it is dead quiet. I can email you a short video if you want.