Good question,
The filter media a resin inside the tank portion last about 10 years.
Then there are two ways taste & oder are removed, and internal chamber of KDF media*. It will last several years, but I don't like to use it, the better alternative is an external cartridge chamber(s) or our triple whole hous filter which gets changed out about once a year.
KDF is a redox media, meaning reduction by oxidation, it is made with copper & zinc, so your adding copper to the water. it is difficult to backwash and may calcify, it takes over 100 gallons to back wash properly wasting water, if not done correctly and most home owners don't know they are rendering it useless.
The external canisters are far superior.
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Nova Water filters
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