Object Pooling

The object pooler is not a scene object but a tool for automatically handling pooled objects.

private GameObjectPooler bullets;

public void Start()
{
    //create a bunch of bullets and put it in the pool
}

//later...
var bullet = bullets.GetOne();
var bulletGroup = bullets.Get(5);

The game object pooler relies on "Active" so any thing that should be in a pool should be deactivated not Destroyed

public class Bullet : MonoBehaviour{
	public void OnTrigerEnter3D()
	{
		this.SetActive(false);
	}
}

There's also a non GameObject pooler for stuff like structs and non GameObjects, but that you need to return the object yourself.