This palm sized filtering system is a easy and convenient way to drink directly from a water source in a survival situation or whenever you’re in the field hiking, running, or backpacking. The filter easily connects to a water bladder or water bottle and is gravity fed. It does not require electricity to use. This filtering system can remove containment as small as 0.1 microns. It removes bacteria such as E. coli, Salmonella and Cholera; and protozoa such as Giardia and Cryptosporidium. The filter is usable for up 3000 liters, but it’s life can be extended by occasional back flushing. The filter system comes with a one-liter water bladder, drink top attachment, two pieces of tubing, carabiner and instruction pamphlet.