This set of charcoal filter refills by Keurig improves the water quality and prolongs the life of your machine. The cartridges give you better tasting coffee by removing impurities from the water. The water filter cartridges are to be used with the Keurig water filter and comes in a pack of six, giving you a one year supply. For use exclusively with the following Keurig Single-Cup Brewing Systems purchased after August 2007: ELITE B40 CLASSIC B44 ULTRA B50 SPECAIL EDITION B60 ULTIMATE B66 PLATINUM B70 B140 OFFICEPRO

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