I am Not using a Clark zapper. I am using a Beck zapper. I am using a magnetic pulser manufactured by "Dr Clark", which is very similar to the Sota magnetic pulser. Sota's is maybe a little bit stronger but the magnetic pulser I am using is still high quality. Again I am using Beck zappers. Not Clark. So one very obvious thing is that Beck's claims are exaggerated to say the least. The zapper is helping with energy levels though.