The correct particle size of ground coffee beans significantly affects the extraction process within the Jura ENA Micro 90. Too coarse a grind results in under-extraction, leading to weak and sour coffee. Conversely, too fine a grind causes over-extraction, producing bitter and astringent coffee. The ideal grind resembles fine table salt, allowing for optimal water flow and flavor extraction during the brewing cycle.
Employing the proper fineness is vital for maximizing the machine’s performance and the quality of the beverage. A consistent and appropriate particle size ensures that the water can adequately saturate the coffee grounds, dissolving the desired soluble compounds. Historically, achieving this level of precision required manual grinders and considerable expertise. Modern automatic coffee machines, like the ENA Micro 90, often include integrated grinders designed to simplify this process, albeit requiring users to understand the relationship between grind settings and coffee quality.