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coffee channeling causes

https://storyquanta.com/s/fzyX7FenXak6ZwpcQkmeU

Coffee channeling happens when water finds a path of least resistance through the coffee puck, often due to uneven tamping, too coarse a grind, or a damaged basket. This leads to a lopsided extraction, where some grounds get over-extracted and others remain under-extracted, resulting in a bitter, sour, or weak shot with a telltale spurting stream from the portafilter.