ProPur NOMAD Prepper Series + 2 - 5 ProPur NOMAD Prepper Series with 2 - 5 ProOne SlimLine filter elements: Silver impregnated self sterlizing - Increase pH up to 9.5 - Remove glyphosate, monochloramines, pharmaceuticals and more. ProOne filters do not require priming - Ideal for just about any water source including lakes, rivers, streams, ponds, rain and tap water. Constructed of heavy duty brushed and polished stainless steel with no seams to rust or leak! Limited 2 Year Warranty - Diameter - 9 Designed for someone who wants the portability of the Propur Traveler but desires a higher flow rate and storage capability like the Propur BIG and sized between the TRAVELER and the BIG...The NOMAD can use 1 filter or can be expanded to 2 filters (2 filters included).