Yes, the first Zapping kills all the parasites, but our envirements are so polluted that we often get very quick reinfections due to our body's inabillity to fight them. While doing a consistant clean up, it's important to take steps to protect your body from the reinfection, So we first kill all the old parasites which have been severely infecting us for years, and when we start eating right and stop using pollutants, they stop coming back. parasites will always come back where they are welcome.