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Iodine does not kill Cryptosporidium.doc


From Ray Brooks,


The Center For Disease Control (CDC) updated their website information on recommended filter size in 2009. 


The CDC now recommends absolute filter size of 1 micron or smaller to remove the common & infectious Cryptosporidium Protozoa.    Katadyn filters pore sizes are: 0.2-0.3 micron absolute.  


The less expensive water bottle filters from:  Outback, Aquamira, and Seychelle  are all 2.0 Micron pore size and are designed to remove Giardia.   The redesigned Katadyn Micro-Filter bottle, now named MyBottle Microfilter has 0.3 micron absolute pore size.  The Katadyn Mybottle Purifier also uses iodine to kill virus, after removing protozoa and bacteria with microfiltration. 



Here's the link to CDC recommended filter size page.   Please bear in mind that they are writing about tap water household filters and squeeze bottles.




Epidemiology & Risk Factors


Many species of Cryptosporidium exist that infect humans and a wide range of animals. The parasite is protected by an outer shell that allows it to survive outside the body for long periods of time and makes it very resistant to chlorine disinfection.