How often should I descale my K-Mini?
You should descale your brewer every 3-6 months, though depending on the mineral content of your water, calcium deposits may build up faster and make more frequent descaling necessary. Regularly descaling helps maintain the heating element and other internal parts that come in contact with water. The descaling procedure takes approximately 45 minutes and requires Keurig Descaling Solution.
From the official Keurig K-Mini Coffee Maker manual, page 4
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