Interesting, I wonder how that would compare to recirculating water through the coffee grounds through a filter. It does say the ultrasound generates 'micro-je

Interesting, I wonder how that would compare to recirculating water through the coffee grounds through a filter. It does say the ultrasound generates 'micro-jets with enough force to pit and fracture the coffee grounds', so I assume that the ultrasound would work better? There also seems research in using ultrasound in artificial ageing of whisky/spirits.