I asked the same question about the zapper and people have told me that it is not necessary for a liver flush. In fact you don't even have to do a parasite cleanse first if you don't want. A zapper plus herbs is better, but the herbs should pass parasites. I haven't done the cleanses yet, except the bowel cleasne, but that is the advice I plan to take. Also I don't know what HCI is, and when I do my flush I'm not going to take ornithine, because I don't know anything about it honestly.