In charcoal filters there are three basic models. The first is the carbon block, the second the activated silver impregnated charcoal also called Chlorgon and a micron rating. Anything with 1 micron rating and below prevents Cryptosporidium and Guardia from passing through as the cysts are larger than this size. Viruses of course cannot be inhibited by a water filter system with a micron rating of more than 0.01 microns.
Tags: water, filter, screensaver
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