From: http://educate-yourself.org/cancer/huldaclark2003rifeconfsummary24oct03.shtml
Highlights of Dr. Hulda Clark's Talk at 2003 Rife Conference

The Important Part
For the last several years, Dr. Clark has had all of her patients bring samples of water from their home when they come to her clinic. She said that she always traces south polarized water to the kind of chlorination used by city water supplies. Water is supposed to be chlorinated using N.S.F. certified chlorine (sodium hypochlorite). But instead, Dr. Clark often finds that they are using common, household laundry bleach! Dr. Clark had already reported in The Cure for HIV/AIDS that laundry bleach is heavily contaminated, esp. with azo dyes. Now she finds that city water treated with laundry bleach contains not only the 5 immune toxins described in the HIV book (PCB's, benezene, asbestos, azo dyes and heavy metals) but also motor oil!! By drinking water sterilized [read contaminated] by laundry bleach, we are continuously exposing ourselves to these toxins and the water containing these toxins is south polarized water.

NOTE: I wrote on this before; for over a year I have owned a water distiller, I was unable to use this water for making Colloidal Silver. I was sure some chemical made it past the processing, which includes Coconut Charcoal filtering. I then started to ozonate my water before running it through the Distiller and that solved the issue.
Only a few weeks ago I stumbled onto the above article and it all made sense. I believe bleach is added to bypass all normal filtration processes.