The versatile Big Berkey system is the ideal system for use at home with small or medium sized families, travel, outdoor activities or during unexpected emergencies. This powerful system filters both treated water and untreated raw water from such sources as remote lakes, streams, stagnant ponds and water supplies in foreign countries, where regulations may be substandard at best. Perfect for outdoor activities and a must in hostile environments where electricity, water pressure or treated water may not be available. The Big Berkey system removes pathogenic bacteria, cysts and parasites and reduces harmful chemicals such as herbicides, pesticides, and VOCs without removing the beneficial minerals your body needs. Constructed of highly polished 304 stainless steel, the system comes complete with four 7" ceramic elements. This system has a storage capacity of about 2.1 gallons and when in use it stands 19.25" in height with a diameter of 8.5". The upper chamber nests within the lower chamber for transport and stands only 13" in height. The system will filter about 25 to 30 Gallons (95-115 liters) per day.