This episode explores the differences between disinfection, sterilization, and inactivation.  We also touch on the Pasteurization.  The podcast also discusses the use and need of the "multiple barrier" approach to water treatment to prevent disease transmitted through potable water.  We discuss past water borne disease outbreaks of Typhus and Cholera in Chicago, Illinois in the mid-1800's and from Cryptosporidium in Milwaukee Wisconsin in 1993 and what has been done to prevent such outbreaks today.