The Katadyn Expedition is the pump filter of choice for large groups.  From the large family on the go, to outfitters, guides, humanitarian relief groups etc, the Katadyn Expedition offers enormous capacity at 26,000 gallons. 

The Expedition features a cleanable 0.2 micron ceramic element for the finest possible filtration.  It's ultra durable and considering it's massive capacity, still reasonably compact for packing.  The Expedition gets the job done fast too with a 1 gallon / minute output.  Includes hoses, prefilter, element and carry bag.