Big Berkey BK4X2 Countertop Water Filter System with 2 Black Berkey Elements and 2 Fluoride Filters Includes Big Berkey stainless steel housing (Upper, Lower, Lid and spigot etc.), 2 Black Berkey Filters, and 2 Fluoride Elements. Holds 2.25 gallons of purified water. Designed for home use for 4 to 16 people The Big Berkey is made with High Grade 304 Stainless Steel and measures 8.5"D x 21"H when assembled Each (1) Purification Element has a lifespan of 3,000 gallons. That's 6,000 gallons for a two-filter system. Each (1) Fluoride Filter attaches onto the stem of the Black Element, as a post filters, and can filter up to 1,000 gallons (3,785 liters).