The Crown Berkey System comes standard with two Black Berkey Elements but can be expanded up to 4, 6, or 8 elements. The Crown Berkey System is Berkey's largest system and is ideal for large groups at home, churches, hospitals, etc. Constructed of highly polished AISI 304 stainless steel. Storage capacity of about 6 gallons (22.7 liters). Upper chamber nests within lower chamber for transport and stands only 20" in height. System includes upper and lower stainless steel chamber, 2 Black Berkey Elements (expandable to 4, 6, or 8), 1 stainless steel lid, 1 spigot, 2 wingnuts, 2 washers, 1 priming button, 6 blocking plugs, 1 rubber gasket to protect the base. For normal everyday use, this system easily serves 6-12 people. Fully configured, this system can serve up to 300-625 people a day, during an emergency. Height when in use: 30". Diameter: 11". Weight 12 lb when empty. The Berkey stainless steel chambers are assembled in the USA from US and imported parts. The Black Berkey Elements are made and assembled in the USA.. Note: Not yet available to residents of California and Iowa. Maximum Filtration Flow Rate: Configured with 2 Black Berkey Elements, the Crown Berkey System can filter up to 6.5 gallons (24.6 liters) of water per hour. Configured with 8 Black Berkey Elements, the Crown Berkey System can filter up to 26 gallons (98.4 liters) of water per hour. Up to 8 PF-2 Fluoride and Arsenic Reduction Elements can be installed in the lower chamber if desired. Flow rate calculated with upper chamber full to top. Flow rate decreases as water level declines.