Big Berkey Water Filter with 4 7" Ceramic Filters and 4 x PF-4 Fluoride Filters Big Berkey stainless steel water filter system (4) 7" 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