This is a premiere In-the-Grille, Push Button, Ice and Water Filter. It does a great job of reducing cysts, asbestos, chlorine's taste and odor, particulates, lead, mercury and more. It also retains beneficial fluoride. This model is NSF certified which ensures consumers they are drinking clean, safe water. Make sure to replace your filter every 6 months. Installation Instructions: Push button to release filter Remove Grille Cap from filter by twisting counterclockwise Reinstall Grille Cap on new filter Insert new filter in refrigerator Push in until it clicks in place *If your refrigerator has the Fast Fill or PUR Measure features, you need to use the PUR Deluxe 4396841 Refrigerator Filter. Otherwise, you can use this 4396710 refrigerator filter. Specifications: 4396710- REFRIGERATOR FILTER Replacement cartridge # T1RFWB2 for Model # T1WB2/ T1WB2LOperating Parameters: Temperature: Min. 33 F Max. 100 F Working Pressure: Min. 30 psi Max.