This Evo model differs from the original both in terms of principle and details: the bag no longer needs to be squeezed, instead the filtration can be done with the help of gravity. The maximum capacity of the filter element has been increased, and is now 5000 liters. In addition, the Evo model has a carbon filter that absorbs chemicals and improves the taste of the water. - Membrane filter's pore size: 0.1 micron - Gravity filtration: fill the water bag, hang it on a branch or door knob and collect the clean water coming from the other end to a container of your liking - Filters 99.99999% of bacteria such as salmonella, cholera and E. coli - Filters 99.9999% of protozoa such as giardia and Cryptosporidium - Filtering speed approx. 450ml/minute without squeezing Package includes: - A 0.1 micron filter - 3 liter water bag - Drinking straw - Cleaning pump Read the instructions for use carefully before use. The water filter should not be allowed to freeze. Freezing will at least j