Not multi-year, but my mother has a culligan reverse-osmosis system (their tap water tastes horrible). There are three filters, the first two get replaced yearl

Not multi-year, but my mother has a culligan reverse-osmosis system (their tap water tastes horrible). There are three filters, the first two get replaced yearly, the RO membrane filter lasts 3 years. Tastes indistinguishable from filtered bottled water.