Origin: Mainland China Type: Water Filter Parts Model Number: PF-2 Number of Pcs: 2pcs/4pcs Certification: NSF/ANSI Standard 42 and 53 Dimensions: 6 x 2.5 inches Installation Method: Easy Screw-on Installation modname=ckeditor HOT SALE NOW: Limited Time Offer! BUY TODAY for Special Pricing! Enjoy unbeatable bulk discounts-buy more to save more. Gain exclusive access to special promotions and early releases. Rest assured with our guaranteed high-quality products. Act Fast! Limited stock and prices won't last. Contact us now to secure the best deal! Berkey PF-2 Fluoride Filters Compatible with Fluoride/Arsenic Water Filters (Set of 2/4) (1) Protects you from harmful springs and well water by effectively reducing fluoride and arsenic. (2) Food grade material, using granular activated carbon and activated aluminum to improve water taste and ensure that harmful substances do not penetrate into the water. (3) Fluoride filters are recommended to be replaced every 1,000 gallons (approximately 307.6 liters), depending on water quality conditions. We would greatly appreciate your patience and understanding as we work to meet demand while ensuring that every piece meets our high-quality standards.