Culligan RC-EZ-4 EZ-Change Premium Water Filtration Replacement Cartridge, 500 Gallons The RC-EZ-4 premium filtration replacement cartridge works as a replacement filter cartridge for the Culligan US-EZ-1, US-EZ-3 and US-EZ-4 Provides cleaner better tasting water for cooking or drinking. It provides 500 gallons of refreshing drinking water for your EZ change system The RC-EZ-4 filter cartridge reduces: particulates class I, chloride, cyst and chloroform, MTBE and Mercury, lead, turbidity, and removes bad taste and odor from water The included RC-EZ-4 filter cartridge is tested and certified by NSF International to NSF/ANSI Standard 42 for the aesthetic reduction of Chlorine Taste and Odor, Chloramines and Nominal Particulate Class 1. Standard 53 for the reduction of Cysts, Mercury, lead, VOC, MTBE and Turbidity The RC-EZ-4 cartridge can filter up to 500 gallons of water or can last for 6 months Water flow rate from faucet, .5 gpm at 60 psi