What Is Filter Coffee?
Filter coffee is a clean and aromatic brewing method obtained by allowing hot water to pass through a bed of ground coffee in a controlled flow. Grind size, ratio, and contact time directly affect the cup result.
Core Brewing Logic
In filter coffee, the goal is to establish a controlled contact time between the water and the coffee bed. The result is determined by three main variables:
- Dose: Coffee quantity
- Grind: Determines flow rate
- Time / Ratio: Determines extraction level
Reference Brewing Range
- Ratio: 1:15–1:17
- Time: 2:30–3:30 minutes
- Temperature: 92–96°C
- Grind: Medium–coarse
These values are starting points; minor adjustments can be made depending on the equipment and the coffee.
Brewing Flow
- Coffee should be ground as close to brewing as possible.
- The filter should be rinsed with hot water and the equipment should be preheated.
- The coffee bed should be evenly saturated during the bloom phase.
- The main pour should proceed in a controlled and continuous manner.
- Total brew time and flow behavior should be evaluated together.
Quick Adjustment
- Sour / weak: Grind finer, extend the time
- Too bitter / heavy: Grind coarser, shorten the time
- Unbalanced cup: Check pour rhythm and ratio
Operational Notes
- Water quality directly affects cup clarity.
- Different drippers and filter types may change flow time.
- The same recipe may require small optimizations across different equipment.
- For repeatable results, ratio, time, and grind should be monitored together.