The Big Berkey System comes standard with 2 Black Berkey Purification Elements, but can be expanded up to 4 elements
The versatile Big Berkey System is ideal for small to medium families, and for use during travel, outdoor activities, or unexpected emergencies
Constructed of highly polished AISI 304 stainless steel
Storage capacity of about 2.25 gallons (8.5 liters)
Upper chamber nests within the lower chamber for transport and stands only 13" in height
Maximum Filters: 4 Black Berkey Purification Elements (in upper chamber) 
System includes upper and lower stainless steel chambers, 2 Black Berkey Purification Elements (expandable up to 4), 1 stainless steel lid,1 spigot, rubber gasket to protect the base, 2 wingnuts, 2 washers, 1 priming button, and 2 blocking plugs
Height when in use: 19.25"
Diameter: 8.5"
Weight: 7 lbs empty
For normal everyday use, this system easily serves: 1-4 people
Fully configured, this system can serve up to 85-170 people a day, during an emergency
Maximum Filtration Flow Rate:
Configured with two Black Berkey Purification Elements, the Big Berkey System can produce up to 3.5 gallons (13.3 liters) per hour
Configured with four Black Berkey Purification Elements, the Big Berkey System can produce up to 7.0 gallons (26.5 liters) per hour
Up to 4  Berkey PF-2 Fluoride and Arsenic Reduction Filters may be installed in the lower chamber of this system if desired
Flow rate calculated with upper chamber full to top. Flow rate decreases as water level declines
Labeling may vary to fulfill orders during periods of heavy demand