Descaling removes the deposits left behind from hard water. These mineral deposits will slow heat transfer if not removed from the heating element. To descale the coffee maker, use 48 oz of undiluted vinegar (household strength) and have a large ceramic mug to hold the output. Empty any water in the reservoir. Pour vinegar into the Water Reservoir and fill to the top of edge of the clear viewing area. Place a mug in the drip tray and press the Large Cup Button. (Do not use a K-cup.) When the brew cycle finishes, pour the contents of the mug into the sink.
Repeat the brew cycle until the reservoir is empty. Open and close the lid between cycles. When the reservoir empty, fill with water and let the coffee maker stand for 4 hours with the unit ON. After four hours, rinse the coffee maker by doing several brewing cycles (again without a K-cup). Discard the liquid after each brew cycle and repeat until the reservoir is empty.
You may need to perform additional brew cycles if you notice a residual taste.
For more information, including a pdf with the directions for descaling of the coffee maker, see
http://www.keurig.com/customer-service/brewer-registration-and-support/frequently-asked-questions .
I hope this helps.
Cindy Wells
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