Switch Group
This can be used to send the particles to a new group. This is very helpful, for example, to avoid always subjecting the same particles to a Condition or Modifier. In this way, particles can also be removed from the sphere of influence of Modifiers or forces that lie under a Particle Group.
Two groups are used here, between which the particles always switch back and forth. One group moves the particles downwards, the other upwards. The group change is triggered by conditions that check the Y-position of the particles.