The Alter Ego filtration technology provides the greatest reduction per contaminant. The Outdoor filter cartridge removes everything up to 4 log (99.99%) from chlorine and heavy metals to agricultural run-off and industrial waste, including giardia and cryptosporidium. Laboratory tested and field-proven over ten years, Alter Ego water filters can transform a questionable water source into clean-tasting, contaminant-free water. The outdoor filter is perfect to fulfill all of your urban and backcountry needs in the northern hemisphere where viruses and water-born pathogens are not a problem.
Removes up to 99.9% of water contaminants including viruses and bacterias
Leaves no metallic after-taste
Vacuum insulated stainless steel bottle
Keeps water chilling cold up to 24h or steaming hot up to 6h
Brings clean water to the developing world through our partnership with ONE DROP