I also use Amazon's subscription service. You select the quantity you want delivered and the frequency. For example, you can choose to have one box delivered every month or every other month. They let you know when it's about to ship in case you want to modify or cancel the next delivery. You get a good discount, no tax and free shipping.
The Keurig does need to be descaled a minimum of every six months, more depending on how often you use it and the quality of your water. I use filtered water and descale every 3-4 months. If it starts getting slow to start pouring, it's time to descale.
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