How do I activate Descale Mode on the K-Slim?
Begin with the coffee maker powered off, then press and hold the 8oz and 12oz buttons together for 3 seconds until the DESCALE light turns solid. When the brew button begins flashing, press it to start the cleansing rinse brew. Continue repeating the cleansing rinse process until the ADD WATER light illuminates. (Page 4)
From the official Keurig K-Slim Single Serve Coffee Maker manual, page 4
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