Water filters remove chlorine and other metals from your water. They need changing every two months (approx. 60 tank refills). This filter is compatible with Keurig® 2.0 K300/350, K400/450/490 and K500/550/590 brewing systems. Not compatible with Keurig® K-cup, Rivo, Vue or Keurig® 2.0 K200/250 brewing systems.