16,000 gallons is said to last 24 months but it really depends on your home use and the quality of the water going through the filter. I've been changing mine for a little less than a year. Much better than bottled water or filtered water in a Britta jug and much more economical in using an under sink filtration system. If I need to buy a replacement filter about once a year, I'll settle for it for convenience and quality.
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