"Where they move to is the risk." Absolutely agree. I believe zapped parasites did succesfuly bloge my bile ducts several times in the process. But why you talking years??? Let me say months! In my case. Keep zapping, keep flushing, keep generaly improving your lifestyle and also doing other cleaning methods if you chose so. Me did pararerly HERBAL parasite cleanse, kidney herbal cleanse, watter therapy apart others. You do not need years!!! All this cleansing stuff DOES work my friends.