Note: Please soak the filter in clean tap water for 3 minutes to flush the filter and release the bubbles before using. 【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. For detailed NSF certification information: Visit the NSF official website, type " AQU-CF08A" into "Brand name/ Trade name/ Model" bar and click the "Search" button. 【High-efficiency filtration】AQUACREST faucet water filter uses premium natural coconut activated carbon block with a reduction rate of chlorine up to 97.2%. By its outstanding filtration performance, the filter can effectively reduce sediments, large particles, rust, taste and odor, which are tested by a third lab, to improve the drinking experience. Please note that the filter cannot reduce TDS. 【Long-lasting service life】This filter has a long-lasting service life. Please replace the filter every 3months to enjoy healthy drinking water, and please note that the specific replacement time may vary based on water quality. 【Compatibility】The AQUACREST faucet filter can be adaptive to PUR PLUS faucet water filter，interchangeable with PUR RF-9999 faucet water filter, for use with PUR Classic, Advanced and Horizontal Faucet Mounts, including 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. This filter is not sourced by or sponsored by PUR.