Overview Material : Plastic Product Dimensions : 9.3"D x 2.3"W x 2.3"H Item Weight : 0.6 Pounds External Testing Certification : NSF Product Benefits : Removes Impurities About this item Compatible models：The white fluoride filter is replacement for the Berkey PF-2 Elements, compatible with Berkey Gravity-Fed Water Filter System, Big, Travel, Royal, Imperial and Crown Series. High-efficiency Filtration：The White Fluoride Filter utilizes carbonate apatite, a natural mineral composite, as the filtration medium, which efficiently absorbs 99% of residual chlorine and fluoride for cleaner, safer drinking water. Durable Life Span: For best performance, replace the white fluoride filter every 1,000 gallons based on water conditions. Note：Each fluoride filter needs to be filled before use. Please refer to the product's instruction manual for details. Function:The primary function of the white fluoride filter is to enhance the taste and quality of water, rather than specifically reducing the total dissolved solids (TDS) content in the water,Note that TDS levels do not fully indicate water quality and our filters do not reduce TDS values!