A single filter for the Water-To-Go GO!, with wear indicator filter. filtration capacity = 130 liters, about 2 months of daily use (4 filling per day). These filters use the same filter technology advanced as those of bottles OUTDOOR: Unlike other filters, Water-to-Go filters simultaneously use three filtering technologies. - First, the activated carbon filter, but unlike conventional filters that dedicate nearly 70% of their surface with adhesives, Water-to-Go Filters are without any adhesive, thereby increasing their effectiveness. By cons, the carbon filters can not filter protozoa, bacteria and viruses, although they remove chlorine and heavy metals. - This is why Water-to-Go uses two technologies, contained in the filter material itself: a nonwoven material developed by NASA using nano-technology in a patented process. On the one hand the nano-pores of 2 microns block contaminants as carbon could not stop, and on the other hand, when the filter is wet, desnano-aluminized emit a positive charge that attracts contaminants protozoal, bacterial and viral. This provides a new level of filtration in an equivalent product. They have been rigorously tested by several independent organizations the most recognized in the world in India, the US and the UK, including BCS (Biological ConsultingServices) in Florida, a highly specialized and recognized organization. BCS found that these filters remove more than 99.9% of most contaminants that may be present in the water (including chemicals, heavy metals, hormones, bacteria, viruses and suspensions of impurities).