Am I at risk of damaging my Keurig machine if I place an ordinary black tea bag inside instead of a K-Cup?
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9Why not just leave the cup enclosure empty and put the tea bag in your mug? – gary Jan 28 '15 at 19:24
It will not damage the machine; However, it won't brew properly. Your tea is supposed to steep inside the water for a set period of time; but the Keurig will simply pour water quickly through it, resulting in extremely weak tea.
So no, it won't damage the machine, but you will not brew your tea correctly.
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"He had found a Nutri-Matic machine which had provided him with a plastic cup filled with a liquid that was almost, but not quite, entirely unlike tea." – fredley♦ Oct 26 '15 at 11:44
Actually, The reason the Keurig machines can brew tea so quickly is because both K-Cups and the My K-Cup add the element of pressure to the steeping equation. This pressure speeds extractions in ways low-pressure steeping does not, meaning the compounds in tea are extracted faster.