Dialing In: Fixing Extraction at Home
The variables behind a flat or sour cup, one at a time: grind, grinder, water, temperature and rest.
6 parts · about 1 hour of reading · Updated Sep 2026
Start with Part 1Who it's for
You brew at home and some cups come out flat, sour or bitter without an obvious reason.
Why read it in order
Each part isolates one variable, in the order that usually matters most: grind first, then water, then temperature. Change one thing at a time and the series works as a checklist for any cup that doesn't taste right.
What you'll learn
- Calibrate grind size by brew method and roast level
- Understand what your grinder changes in extraction
- Adjust for your tap water and brewing temperature
- Diagnose a flat or sour cup one variable at a time
In this series
- 01
Brewing Light Roast Indian Coffee: What's Different
Light roast Indian coffee needs higher extraction energy than medium or dark roast — denser beans, more delicate flavor compounds, and different behavior in the cup. If your light roast tastes sour or flat, the variables are different from what most Indian brewing habits are calibrated for.
14 min read
- 02
Grind Size for Indian Coffee: How to Calibrate by Method and Roast
Grind size determines how fast water extracts from coffee — and for Indian specialty buyers, the standard per-method chart is a starting point, not a fixed answer. Thirty percent of ICB's catalog is light or light-medium roast, coffees that are denser and systematically underextract at standard chart settings. This reference covers the per-method calibration table, the Indian density adjustment, and how to read extraction feedback from the cup.
10 min read
- 03
How Grinder Choice Affects Extraction of Indian Light Roasts
Indian light roasts are denser, less brittle, and mostly natural-processed — three factors that make them exceptionally sensitive to grind quality. Here is what happens inside your grinder, why it matters more than your brew method, and how to calibrate at every price point available in India.
10 min read
- 04
Water for Brewing: Indian Tap Water and Coffee Extraction
Most Indian specialty coffee buyers carefully select beans, wait for the right rest window, and calibrate grind. Water, which makes up 98% of every cup, is left almost entirely to chance. Municipal tap water in most Indian cities runs well above coffee brewing targets, and the most common household fix, RO filtration, over-corrects in the opposite direction. This is a field guide to what Indian water looks like by city, what it is doing to extraction, and how to adjust.
13 min read
- 05
Water Temperature for Coffee: What to Use, and Why Your Altitude Changes It
Brewing guides give the same 90–96 °C range and assume the kettle boils at 100 °C. In Bengaluru it boils at about 97 °C; in Ooty, about 92 °C. This reference covers the range, per-method targets, a boiling-point table for Indian cities, and how to reach a target with an ordinary kettle.
7 min read
- 06
Why Your Specialty Coffee Tastes Flat (Common Extraction Issues)
Specialty coffee that tastes flat, weak, or sourly thin is almost always an extraction problem — not a coffee quality problem. This guide covers the six most common causes, with particular attention to Indian variables: hard tap water, RO-stripped water, mixer-grinder use, and tropical storage conditions.
10 min read
