Berkey CRN8X4-BB Crown Water Purification System with 4 Black Elements INCLUDES: Crown Stainless Steel Containers (Upper, Lower & Lid), 4 Berkey Purification Elements, 4 Hole Plugs, and one set of easy to follow assembly instructions Holds 6 gallons of purified water & Filters up to 13 gallons per hour (running with the 4 included filters) The Crown is made with High Grade 304 Stainless Steel and measures 11"D x 31"H Each (1) Berkey Purification Element has a lifespan of 3,000 gallons. That as 12,000 gallons for a four-filter system. Crown Berkey system is the ideal system for use with medium to large groups