Keurig Replacement Water Filter Cartridge, Set of 8 Charcoal Compatible with the following Keurig brewing systems: Keurig 2.0, Elite B40, Classic B44, Ultra B50, Signature B60, Special Edition B60, Ultimate B66, Platinum B70, Select B77, Platinum Plus B79, B150, OfficePRO Premier B155 and V700 For best results, replace every 2 months or 60 tank refills Disposable