If the body is not eliminating some mercury naturally, there is usually gut/liver issues, and too many other things burdening the immune system as well (e.g infections, viruses etc).

Some mercury is naturally eliminated by the body itself, but most of it is bound up tightly and needs chelating. But what happens when someone's system is overwhelmed? I just feel that things get recirculated and the person literally remains poisoned or is repoisoned continually.

I think chelation is necessary but I reckon the person needs to address their gut and liver with appropriate diet and supplements as well, or before chelating at all.

That's just my ten cents worth.