
Troubleshooting
When Coffee Tastes Muddy: The Problem of Fines
When a cup lands with a hazy, heavy, or over-layered quality — sometimes described as muddled — the cause is usually fines. Fines are the very small particles produced during grinding, finer than the main grind setting, and they extract faster than the surrounding coffee. When there are too many of them, they over-extract while the rest of the bed is still developing, and the cup takes on a thick, unfocused character.
Fines are a function of how the grinder works. Burr grinders produce fewer than blade grinders, and better burr grinders produce fewer than entry-level ones. Some fines are unavoidable in any grind; the goal is to keep them to a proportion that does not dominate the cup. Rinsing the filter thoroughly before brewing helps carry away any loose fines that would otherwise arrive in the finished brew.
Shifting to a slightly coarser grind reduces the proportion of fines in the bed. Switching to a grinder with higher-quality burrs does even more. Café de Volcán considers grinder quality one of the most direct paths to a cleaner cup, because consistent particle size is the foundation of consistent extraction.












