About This [High-efficiency Filtration]:Virego Water Filters for Berkey Water Filter Replacement effectively reduce fluoride and arsenic, absorb odor, color, residual chlorine, heavy metals,they also reduce sediments and large particles effective in improving taste [Black Purification Elements]: Virego water filter with adopt high-quality natural coconut shell activated carbon. strictly control filtration materials and produce them with lead-free, BPA-free materials to ensure excellent filtration performance and user safety [Fluoride and Arsenic Filter]:The white fluoride filter for pf-2 replacement is made of natural mineral synthesis material Carbonate Apatite as the filter medium. Efficient absorption of 99% residual chlorine and fluoride [Compatible with Berkey]: for Berkey Filters Replacement, compatible with Big, Travel, Royal, Imperial, Crown, Light series gravity filtration system, has the same powerful purification capacity as the original brand [Durable Life Span]: To achieve optimum performance, we recommend you replace the black filter every 6000 gallons per pair and replace Fluoride Filter White Fluoride Filter every 1000 gallons per pair,which will vary based on water conditions Virego - Risk-free shopping brand, one of the most trusted brands on Amazon. Your problem will be solved within 12 hours - Any problem with the product can be directly refunded in full or replaced with a new product! Note that! TDS level does not fully indicate the quality of the water and our filters does not lower TDS value Overview Material : Gravity Water Filter for Berkey Water Filter Replacement Product Dimensions : 10.55'D x 6.46'W x 6.26'H Item Weight : 2 Pounds External Testing Certification : NSF Product Benefits : Virego Water Filter