Katadyn TRK Drip Ceradyn Gravity Personal or Group Water Filter, Long-Lasting Up to 150,000L, Cleanable 0.2 Micron Ceramic Elements for RV, Cabins, Base Camps and Emergency Preparedness Practical filter for long-term use like camps and construction sites For 1 to 6 persons Gravity filter--convenient water filtration without pumping Comes with three ceramic filter elements Ceramic filters can be cleaned several times