Big Berkey with 4 9" Imperial Ceramic Filters and 4 PF-4 Fluoride Filters Big Berkey stainless steel water filter system (4) 9" x 2.75" Imperial British Berkefeld Ceramic SuperSterasyl Filters (4) PF-4 Filters reduce fluoride, lead, arsenic, MTBE, and more Can filter up to 30 gallons per day Holds 2.25 gallons of filtered water