How do I fix a stalled pour over?

A stalled pour-over is rarely a mystery; it is a physical manifestation of particle migration. When coffee is ground, it produces a distribution of sizes ranging from large 'boulders' to microscopic 'fines.' During the brewing process, gravity and water flow pull these fines toward the bottom of the filter, where they settle into the pores of the paper. This creates a dense, impermeable layer that effectively seals the brewer, causing the drawdown to crawl or stop entirely. While many suggest simply grinding coarser, the producer’s perspective reveals a deeper nuance: the amount of fines is often determined by the quality and alignment of the burrs in your grinder, not just the setting. If you are using a high-quality, light-roast coffee—which is denser and more brittle—it will naturally produce more fines than a softer, dark-roast bean. A common misconception is that agitation (swirling or stirring) is always beneficial. In reality, excessive agitation during the final stages of a brew can accelerate the migration of these fines into the filter, causing a stall that might have been avoided with a gentler technique. If you find your brews consistently stalling despite a sensible grind, reduce your agitation in the final pour. By treating the coffee bed as a dynamic filter medium rather than a static ingredient, you can better manage the flow rate and preserve the clarity of the cup.