How do I stop my pour-over from stalling?

There is nothing more frustrating than a pour-over that refuses to drain. You are halfway through your brew, and the water is just sitting there, refusing to pass through the bed of coffee. This 'stalling' is a common issue, and it almost always comes down to the physical behavior of your coffee grounds.

The primary culprit is the presence of fines. Every grinder produces some amount of dust-like particles, but lower-quality grinders produce a disproportionate amount. When these fines get wet, they turn into a paste that clogs the pores of your filter paper, effectively sealing the bottom of your brewer. If your brew time is significantly longer than expected, your grinder is likely the first thing you should investigate.

If you cannot upgrade your grinder, you can try a few workarounds. First, consider your filter paper. Some papers are thicker and more prone to clogging than others. Switching to a different brand or a different type of paper can sometimes solve the problem instantly. Second, look at your pouring technique. If you pour water directly onto the center of the bed with high force, you are physically driving those fines down into the filter. Try pouring in a gentle, circular motion, and avoid pouring directly onto the paper itself.

Another factor is the coffee itself. Some beans, particularly those that are very light-roasted or processed in certain ways, are more brittle and produce more fines when ground. If you notice stalling only with specific coffees, it might be the bean's structure rather than your grinder. In these cases, a slightly coarser grind can help, as it reduces the total surface area and the amount of fines produced.

In practice, stalling is a sign that your extraction is becoming uneven. When the water sits in the brewer, it continues to extract, but only from the grounds at the bottom, leading to a bitter, over-extracted cup. By focusing on grind consistency and gentle pouring, you can ensure a steady flow rate and a much cleaner, more balanced cup of coffee. Don't be afraid to experiment with these variables until you find the flow that works for your setup.