Manually select particles you want to remove (because of collision error)

[pastor]

Make a box (or any other object) that you want to kill them.
Add an surface test operator - pick your "kill object", adjust  the distance parameter to your liking.
Wire that operator to second event that only have delete operator.

And there you have it Every object that is close enough (by the distance parameter) to the kill object will be deleted.

Thank you very much d4rk3lf for your help !

It solved my problem ! but first It tooks me time to figure :

1/ the surface test object was a kind of lathe with a cavity and it didn't work, until I cutted the object in 2 half and assigned both of them in the surface test.
2/ the accuracy had to be boosted from 1 to 5

So now it seems to work

But I have other issues :

I know I may abuse, but if you have time, could you have a look on my file ?

https://gofile.io/d/8gnWdN  (3dsmax 2017 and 2020 )

I just want to fill a container with coffee chunks ( I used in the operator SHAPE :  mesh type Chunks (round) may be i have to make first my particles in real geometry ? ) but at the end of the simulation, the particles are still jittering and moving and a lot of particles are interpenetrating and going outside the container

in fact when I see this example made with realflow, it looks rather simple but I think I'm lost in the sea of tyflow parameters
https://www.youtube.com/watch?v=qGLPtGbO...v&index=12