Agitative
The Journal
The Coffee-to-Water Ratio Explained: How to Dial In Every Brew Method
What a 1:16 ratio actually means, why it's the single biggest lever on strength, and how to pick a starting ratio for espresso, moka pot, French press, pour-over, drip, and cold brew.
A Complete Grind Size Guide: Matching Your Grinder to Your Brew Method
Why grind size has to match contact time, what happens when it's wrong in either direction, and a method-by-method reference from Turkish coffee's near-powder to cold brew's extra-coarse grounds.
How to Bloom Coffee Properly (And Why It Matters)
The science behind the first small pour in pour-over brewing, why fresher beans need a longer bloom, and how to tell when the bloom has actually finished doing its job.
TDS and Extraction Yield: What Every Home Barista Should Know
How a refractometer reading becomes an Extraction Yield percentage, what the SCA's 18-22% gold-cup range means in practice, and how to use both numbers as a diagnostic rather than a rulebook.
How Much Caffeine Is Really in Your Coffee?
Why brewing method matters less to total caffeine than most people assume, why a small espresso shot and a big drip mug can land in a similar range, and why any estimate should be treated as a range, not a precise figure.
Espresso vs. Moka Pot vs. Chemex vs. Siphon: Choosing a Brew Method
A side-by-side look at four very different ways to make coffee — pressurized espresso, stovetop moka pot, gravity-fed Chemex, and the theatrical vacuum siphon — and what each one is actually good at.
Water Chemistry and Coffee: Why What's in Your Kettle Matters
Coffee is mostly water by weight, so its mineral content quietly shapes extraction and flavor — what hardness and alkalinity actually do, and simple ways to improve the water you're already using.