Immerse the probe tip into the sample liquid. Ensure that the probe is immersed to a depth
that is at least 1.5 times the tip diameter. If the probe is immersed to an insufficient depth,
air will be injected into the sample, causing the sample to foam. Processing at a lower
intensity setting without foam is more effective than processing the sample with foam as
ultrasonic cavitation will be diminished. Decreasing the intensity setting, increasing the
processing time, and lowering the sample temperature will usually prevent foaming. Also
ensure that the probe tip is not touching the wall of the sample vessel as it may be damaged
and it will not vibrate properly