The resonant ultrasonics in water cause cavitation. Kenneth Shoulders says that charge clusters happen in cavitation because the forming bubble creates charge separation, this environment ultimately causes energy to precipitate out into electrons. The charge clusters can entrain ions. When the bubble collapses on the surface of a segment of ECCO fuel, this forces the whole package into the fuel grain, hence

Resonant Ultrasonic Bubble Ion Implantation Technology.

Note that an ion can be as simple as a proton that is formed in the plasma as the bubble collapses.