Randomize the filtering process to get more realistic results.
Percent
This is the probability of a particle to be filtered when it satisfies the filter condition. Higher values mean that more particles will be filtered.
Seed
Change the random number generator's initialization. All positive and negative integers are accepted.
Per Frame
When active, the filter test will be performed per frame, not per simulation step. As a consequence, a particle's probability of being filtered decreases.