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 18cm ceramic elements, and 4 PF-4 Fluoride filters. The PF-4 filters screw onto the ceramic filters and work in conjunction to remove or reduce fluoride, lead, MTBE, arsenic, and other contaminates. This system has a storage capacity of about 2.2 gallons (8.2 litres) and when in use it stands 49cm in height with a diameter of 21cm . The upper chamber nests within the lower chamber for transport and stands only 33cm in height. The system will filter about 24 to 30 Gallons per day.