[URGENT] Destroying Particle Systems

[JenniferOrange]

Nope, the particle system just stays there. Here's the script:

Spoiler below!

void OnStart()
{
SetEntityPlayerInteractCallback("special_burner_1", "Fire", false);
AddUseItemCallback("", "mix_notdone_1", "special_burner_1", "Boil", true);
}
void Fire(string &in asEntity)
{
CreateParticleSystemAtEntity("", "ps_fire_lab_burner.ps", "funnel_1", false);
CreateParticleSystemAtEntity("", "ps_bubbles.ps", "funnel_2", false);
AddTimer("MakeMix", 5, "Finished");
}
void Boil(string &in asItem, string &in asEntity)
{
SetEntityActive("mix_notdone_static_1", true);
RemoveItem("mix_notdone_1");
}
void Finished(string &in asTimer)
{
SetEntityActive("mix_notdone_static_1", false);
SetEntityActive("mix_done_1", true);
DestroyParticleSystem("ps_bubbles");
}

void OnEnter()
{

}

void OnLeave()
{

}

ps_bubbles is what I'm trying to destroy.