Spot the channel before you blame the bean
Identify channeling evidence in a brewed coffee bed and connect it to uneven extraction.
The cup tastes sour and bitter even though the TDS number looks normal. Find the visual issue that best explains uneven extraction. Deep trench through one side of the coffee bed Correct. The trench suggests water found a low-resistance path, extracting some grounds too little and others too much. Glass server below the dripper The server holds the brew, but it does not explain the sour-bitter split. Kettle beside the brewer Temperature matters, but the stated water temperature is stable. The visual bed problem is stronger evidence. Clean upper rim of the paper filter The rim is not the main…
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