The Swift Green SGF-WF1CB Refrigerator Filter (Frigidaire WF1CB Replacement) is a great way to keep your refrigerator working in a good condition. Refrigerator filters need replacements every six months as old refrigerator filter cartridges might induce an odor and bad taste in water. They may leak contaminants and bacteria in the water, making it unfit for drinking. With Swift Green SGF-WF1CB Refrigerator Filter (Frigidaire WF1CB Replacement) you will be provided with up to 100 gallons water. It reduces 99.30% of Lead, 99.99% of Cysts, 99.80% of Class I Particulates, 97.80% of Class I Chlorine, 94.2% of 2,4-D (a common herbicide), 99.70% of Turbidity, 87.5% of Toxaphene, and 94.9% of Atrazine. This cartridge has to be replaced every 6 months.