[at-l] Filter Pore Size and Water Purification Techniques Web Site

[WHHAWKINS@aol.com]

For optimal results, always select a filter with a pore size of no greater
than 0.4 microns if you expect it to protect you from bacteria such as
cholera, typhoid, and E. coli. Several filters combine a larger pore-size
filter with a resin which releases iodine "on demand". They are generally
effective for bacteria and viruses. A filter without the iodine resin, even
with a pore size less than 0.4 microns, will not 
eliminate viruses - if you use one of these on water which is likely
contaminated with human waste, it would be wise to pre-treat the water with
iodine.

 <A HREF="http://www.travelhealth.com/purwtr.htm">Water Purification
Techniques</A> 
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