This is the EZ-Clean Membrane filter element for the Katadyn Tactical BeFree Water Filtration System. It filters to 1 Micron, will filter 2 liters per minute and will last for 1000 liters.
It comes with a 1 liter Hydropak Softflask. If you need to treat your water for viruses, Katadyn suggests the Steripen UV system
www.katadyn.com/en/de/50541-8020426-BeFree-1.0L-tactical
Tags: Katadyn, Warrior West