Culligan D-15 Basic Drinking Water Filtation Replacement Cartridge, 250 Gallons (2 Pack) The D-15 basic filtration replacement cartridge works as a replacement filter cartridge for the Culligan US-550 and RVF-10 Provides cleaner better tasting water for cooking or drinking The D-15 filter cartridge reduces: Chloride and removes bad taste and odor from water The D-15 is Tested and Certified by NSF International against NSF/ANSI Standard 42 for the reduction of aesthetic Chlorine Taste and Odor The D-15 cartridge can filter up to 250 gallons of water or can last for 3 months Water flow rate from faucet, 1 gpm at 60 psi