NSF certifications: Tested and certified by NSF International against NSF/ANSI standard 42 for the reduction of chlorine, taste and odor, and to NSF/ANSI 372 for lead-free material. Ultimate purity: The filter uses revolutionized technology for water filtration, reducing impurities and giving you fresh water. Please note that the filter cannot reduce TDS. Great water: Reduces harmful substances to make sure your every sip clean and refreshing. You’ll enjoy 3 months of crisp tasting water directly from your faucet. Please refer to the instructions for details. Smooth water flow: Keep sediment and other impurities out of your water to maintain smooth water flow. Please soak the filter in clean tap water for 3 minutes to flush the filter and release the bubbles before using. Compatiblity: Interchangeable with PUR RF-9999 water filter; Fits for PFM100B, PFM450S, FM-3333, FM-9400B, FM-3700B, FM-3700, FM-2000B, FM-9000B, FM-4000B, FM-4100B, FM-2500V, FM-3400B, PFM350V, Pur-0A1, FM-9600, PFM150W, PFM400H, PFM-270G, PFM800HX, FM-9600 and more models. For use with PUR Advanced Faucet Mounts and PUR Advanced Plus Faucet Mounts. Please note this is a compatible spare part and the manufacturers' names and part numbers have been used for reference purposes only. Waterdrop is an independent brand. Waterdrop C08A Faucet Water Filter, Compatible with All PUR PLUS Water Filter, PUR PLUS RF9999 Faucet Water Filter, NSF 42 Certified, 3-Month, 300-Gallon, 1 Pack