What mechanical advantage might the ultrasound method hold over Fionn Ferreira's magnetic ferrofluid approach?

Answer

It may be less reliant on the specific magnetic properties of the plastic contaminant.

The ultrasound method offers a mechanical advantage by potentially not depending on the specific magnetic characteristics of the plastic particles, unlike the ferrofluid technique.

What mechanical advantage might the ultrasound method hold over Fionn Ferreira's magnetic ferrofluid approach?
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