Flexzion Water Filter Purifier Absolute Filtration Purification System Kit Portable for Outdoor Emergency Survival Travelling Hiking Camping Fishing in Army Green 2000L water will this purify before the different filters need replaced Smallest: can be held in glasses box Environment friendly: cleanable filter cartridge High filtration fineness: unique dual ceramic membranes cartridge with mean pore size of 0.1 micron Ideal for soldiers, hiking, camping, fishing, hunting, climbing, trip/ travel, out-door work, survival, emergency and also refugee and rescuer in earthquake or flood area etc.