Suggested Retail: $483.99. Big Berkey Gravity-Fed Water Filter System 2.25 Gallon with 2 Black Berkey Elements, 2 Berkey PF-2 Fluoride and Arsenic Reduction Elements. The Big Berkey Gravity-Fed Water Filter System is a practical and cost-effective solution for water filtration. It requires no electricity, costly installation, or tools, providing long-lasting water filtration for just pennies a gallon. The system includes 2 Black Berkey Elements and 2 Berkey PF-2 Fluoride and Arsenic Reduction Elements. Each pair of Black Berkey Elements lasts for up to 6,000 gallons before replacement is recommended. The Berkey PF-2 Elements are designed to adsorb fluoride, arsenic(V) and pre-oxidized arsenic(III). Brand: Berkey. Model: BK4X2-BB-PF2. Lot Sticker: OH001-00000561-62. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.