Kyle Rowsell

The Flaw in Prescription Recipes Many home brewers chase the perfect cup by mimicking the exact variables of world-class baristas. They buy the same Hario V60 and use the same gram-for-gram recipes, only to find the results muddled or inconsistent. The reality is that formulaic recipes rarely translate across different environments. Your water quality, specifically mineral hardness, acts as a primary variable that dictates extraction speed. Furthermore, grinder alignment and manufacturing tolerances mean your "setting 20" is fundamentally different from mine. Most high-extraction recipes fail because they demand elite-tier grinders that produce narrow particle distributions. When average grinders attempt these fine settings, they produce excessive fines that cause channeling and bitterness. To combat this, smart brewing strategies must move toward methods that tolerate coarser grinds while maintaining high efficiency. Percolation vs. Immersion: A Solvent Battle Understanding the mechanics of extraction requires looking at how water interacts with coffee. In percolation, such as a standard Chemex, you constantly introduce clean solvent. This is highly efficient because fresh water has the highest potential to pull solubles from the grounds. However, it is prone to unevenness; water naturally finds the path of least resistance, creating channels that over-extract some grounds while leaving others under-extracted. Immersion brewing, like a French Press, is the opposite. The water sits with the grounds, extracting "coffee with coffee." As the water becomes saturated, its solvent power decreases, making the process slower but remarkably even. While immersion is more forgiving of poor grind quality, it often lacks the vibrant acidity and clarity found in top-tier percolation brews. The Rise of Percolative Immersion The most exciting development in modern coffee tech is the marriage of these two methods. By using a device with a valve, like the Hario Switch or the Next Level Pulsar, you can steep the coffee to ensure even saturation and then release it for a final percolation phase. This hybrid approach allows you to use much coarser grounds. Coarser grounds are more uniform across almost every grinder on the market, from entry-level hand grinders to professional flat-burr machines. By grinding coarse, you reduce the risk of bitterness and clogging. The initial immersion phase ensures every particle is fully saturated, and the subsequent percolation phase "rinses" the remaining sugars and acids out of the coffee, giving you the body of a French press with the clarity of a pour-over. Hardware Innovations: Switch and Pulsar The Hario Switch has become a staple because of its versatility. You can seat various drippers on its base, including the Kono or even a Fellow Stag X, to customize the bypass and thermal properties. The Kono is particularly effective here because its lack of full-length ribs reduces bypass, forcing more water through the coffee bed during the percolation stage. Meanwhile, the Next Level Pulsar—developed in collaboration with Jonathan Gagne—represents the zero-bypass evolution of this concept. Unlike the Switch, which still allows some water to escape around the filter, the Pulsar forces every drop through the bed. This allows for even coarser grinds—some exceeding 1,000 microns—while still achieving extraction yields of 20% to 22%. Practical Application for the Home Brewer You don't need a massive gear collection to implement these principles. If you use a Clever Dripper, try pouring the water first and then adding the coffee to prevent fines from clogging the filter immediately. If you're struggling with a standard V60, consider switching to a hybrid method that incorporates a steep phase. Ultimately, the goal is to reduce the number of ways a brew can go wrong. By moving toward coarse-grind hybrid brewing, you eliminate the need for precision pouring techniques and expensive grinders. You get a repeatable, sweet, and vibrant cup that works with the gear you already own.