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Aquamira's Miraguard anti-microbial technology designed for use with sport bottles with straw attachments. Simply attach the filter to the water bottle straw, screw the bottle lid and drink. The Aquamira Sport Bottle Filter removes contaminants down to 2 microns, including Giardia, Cryptosporidium and E.Coli. Eliminates 99.9% of harmful giardia, cryptosporidium and other pathogens. The thick-walled porous plastic filter provides greater effectiveness and longer life than common thin-walled filters. The activated carbon reduces waterborne chemicals and improves taste. No Limit to number of times it can be used. Offsets the disposal of 400+ water bottles. No Backflush. Does not include the bottle.