How do I brew a full carafe with the K-Duo Essentials?
Fill the water reservoir to the MAX fill line, remove the filter basket drawer, and insert a 12-cup paper filter. Add ground coffee (1 tablespoon per cup recommended), then reinsert the filter basket drawer completely. Make sure the carafe is on the heating plate, press the CUPS button, and select your brew size. The heating plate will automatically stay on for 2 hours after brewing. (Page 3)
From the official Keurig K Duo Essentials manual, page 3
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