AQUACREST Replacement 9999 Water Filter, Compatible with Pur RF-9999 Faucet Replacement Water Filter (Pack of 6) Delicate design ensures a perfect fit for the original. Optimal performance for up to 3 months or 100 gallons, whichever comes first will vary based on water conditions. Convenience and value Easy to install. For detailed instruction, please kindly refer to the Instruction Manual in the box. Interchangeable with PUR RF-9999 water filter; For use with PUR Advanced Faucet Mounts and PUR AdvancedPlus Faucet Mounts. This filter is not sourced by or sponsored by PUR. The manufacturer'name and part number have been used for reference purposes only.