Seychelle 20oz EXTREME RAD/ADV Replacement Filter The Extreme filter removes up to 99.99% of Chlorine, Chemicals (VOC’s), Heavy Metals and Radiological Contaminants.  It removes up to 99.9999% of Bacteria and Virus and 99.9% of Giardia and Cryptosporidium for up to 100 gallons of safe drinking water.  The Extreme filters are perfect when using water of an unknown quality, or emergency preparedness, when survival is threatened by earthquakes, hurricanes, tornadoes, floods, fires, radiological contamination or terrorism. Removes up to 90% Fluoride