Espresso Brew Ratio:1:2.1 Extraction Time:30-35 seconds. This means that for every gram of ground coffee dosed into the porta-filter there is 2.1 grams of coffee extracted. If using and dosing with an 18g porta-filter you can extract approximately 38-grams of liquid (coffee). Still stuck? Check out this link to learn more about brew ratios:https://www.youtube.com/watch?v=-yhX2Wtx2JA
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