When your Keurig boils water, the water steams up into a gas, but hard minerals remain as scale. This is the same whether you're using a Keurig Slim, Keurig 2.0, or any of the best Keurig machines.
Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...
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