Because I'm having problems with mine. First of all, which way do you turn the dial to lower water height in the body? I have the SM 122 and it's overflowing like crazy.
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This was it. I never knew this adjustment would make a difference. I thought this screw was just for silencer.Adjust the bubble size screw on the small airflow chamber. I have mine just barely open I like super small bibles, then adjust the water level dial until it's perfect.