Water Chemistry Post-Brew: A New Frontier in Coffee Extraction
The Shift in Extraction Theory
For decades, coffee professionals operated under the assumption that mineral content primarily dictated the efficiency of extraction during the brewing process. However, recent insights from suggest a radical alternative: minerals added after brewing yield identical flavor profiles to those present during the initial extraction. This shift suggests that cations like calcium and magnesium may not influence the chemical extraction of flavor compounds as significantly as previously believed, but rather serve as flavor modulators for the final beverage.
The Role of Alkalinity
Alkalinity acts as a buffer for coffee's natural acidity. In a controlled experiment using drops, varying levels of alkalinity—10, 30, 50, and 70 parts per million (PPM)—revealed distinct shifts in perception. At 10 PPM, the coffee remained tart and citric but lacked balance. Increasing to 30 PPM created a sweeter, more well-rounded profile. Beyond 50 PPM, the acidity began to flatten, introducing chocolatey notes but also undesirable "chalky" or "cardboard" textures.
Practical Customization with Lotus Drops
and demonstrate that brewing with distilled water and adding minerals post-brew offers a powerful troubleshooting tool. Since most roasters dial in their beans using specific local water, a consumer's home water chemistry might clash with the intended roast profile. By using concentrated drops, users can adjust hardness and alkalinity in real-time to match the roaster’s original intent or suit personal preference without wasting entire batches of coffee.
The Hardness Constant
While alkalinity drives the balance of acidity, general hardness—comprising calcium and magnesium—contributes to mouthfeel, creaminess, and complexity. Maintaining a constant hardness of 60 PPM while adjusting alkalinity allows for a systematic isolation of flavor variables. This level of control is essential because roasters often fail to provide detailed water chemistry data, leaving the consumer to bridge the gap between a sour or flat cup and the ideal extraction.
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UNLOCKING YUMTOWN: Testing with Scott Rao
WatchLance Hedrick // 9:02
What's up, everyone! Lance Hedrick here. Coffee Pro of a decade, coach two 2x World Barista Champion runner-ups, past Latte Art Champion, academic in remission, and extremely neurodivergent weirdo. I teach all interested in coffee everything about coffee, from coffee science, theories, brew methods, machine reviews, and more. And, I am a weirdo. I have a patreon listed below. I hope to purchase all products shown on this channel and subsequently giving them away to supporters. Cheers!