Anyone with a the Z 6 experience a lot of noise with it? First off, leaving the intake tube completely open it's in constant overflow mode no matter what level the water is at. I put an inline valve in the intake tube which solved the overflow problem. All the noise in the video is caused by air. If I pinch the air tube to stop all air intake the pump is dead quiet. As soon as I release the tube the noise starts. It does this with the air tube completely open and with the valve partially closed.

