In the process of looking up some old studies on HIV, I found this which may explain why a good Clark Zapper is needed in addition to Beck.
"Research published in the journal of AIDS, PNAS and Nature’s Medicine (3) have found that up to 86% of all HIV virus in your body is in the intestines" From: http://www.keephopealive.org/report19.html
Since the Beck Zapper only works on the Blood, the Pulser is called for, but I do not see the efficacy in it. A good Zapper with a 4 point contact system, 3 points positive is able to reach the intestines.