Systems using the Culligan RC-EZ-3 spare water filter: Culligan IC-EZ-3 Culligan RV-EZ-3 Inline Coolant Filter System Recreational Vehicle Filter System Culligan US-EZ-3 Filter System of filter for the sink Culligan RC-EZ-3 Inline Refrigerant Filter System Culligan IC-EZ-1 Culligan IC-EZ-4 System Culligan RV-EZ-1 Recreational Vehicle Filter System Culligan RV-EZ-4 System of vehicle filter Recreational Culligan US-EZ-1 Filter system for down sink Culligan US-EZ-4 Spare filter system Culligan RCEZ3. Filter Cartridge Life The Culligan RC-EZ-3 has a filter life of up to 6 months or 500 gallons. The service life of the water filter will also depend on the quality of your water and your water use. The filter should be replaced first if you notice that tastes and odors return to the water or the water pressure is decreasing significantly. Culligan RC-EZ-1 - Interchangeable Water Filter Cartridge Culligan RC-EZ-3 - Better Filtration Culligan RC-EZ-4 - Better Filtration. . . . . Package of