Nu-Calgon part number 9618-21. Pentair Everpure 7CB5-S Carbonblock Water Filter Cartridge. Details: Filter cartridge for premium quality water. Carbon block filter finely polishes water for high quality beverage and food applications. Sanitary cartridge replacement is simple quick and clean. Internal filter parts are never exposed to handling or contamination. Effectively filters dirt and particles as small as five microns in size.* Reduces chlorine taste and odor. Reduces limescale build-up in water-using equipment.* * As tested by Everpure. Operating Parameters: Capacity: 10 000 gallons (37 850 L) Working Pressure: 10-125 psi (0.7-8.5 bar) non-shock Water Temperature: 35-100 degrees F (2-38 degrees C) Flow Rate: 2.5 gpm (9.5 Lpm) System Tested and Certified by NSF International against NSF/ANSI standards: Standard no. 42 - Aesthetic Effects Chemical Reduction: Taste and Odor Chlorine