Keep your Keurig brewing system running smoothly with this set of Keurig replacement water filter cartridges and bottle of descaling solution.The filters are made from charcoal, while the descaling solution is a citric acid base solution.The solution works faster than white vinegar and is made to be odourless and biodegradable.The filters can be used with a variety of Keurig K-cup and Keurig Vue brewing systems including 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.To use, simply place a cartridge into the water filter assembly and insert into your water reservoir.Packaged in a set of six, these water filter cartridges should be replaced every two months or after 60 tank refills.In addition to the filters, the included bottle of Keurig descaling solution will help to improve the quality of your Keurig beverages.The solution should be used every six to eight months to remove calcium and scale build-up that can hinder your brewer's efficiency.