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To goal of a proper grind is to get the most flavor from your coffee and the grind should match the brewing method. The size of the grind is important to the flavor of the coffee. If you buy whole bean coffee, you will want to grind your beans as
close to brew time as possible - no more than two minutes before.
Drip coffee requires a medium grind, espresso requires a fine grind, a French press and vacuum pot require the largest grind
The rule of thumb is that the finer the grind, the more quickly the coffee should be brewed. For instance, the grounds used in an espresso machine are finer than those that are to be brewed in a drip system.
To become familiar with the sizes of grounds, pick up some grounds and rub them between your fingers.
Once you have the right grind and have brewed a pot, do not reuse the grounds. The desirable flavors will have been extracted during the first brew and all that will be left are the bitter undesirable flavors.