AeroPress

The AeroPress was invented by Alan Adler, an American engineer and inventor known for the Aerobie flying ring. It was launched in 2005 after Adler sought to create a brewing device that addressed the problems of bitterness and acidity in home-brewed coffee. The AeroPress Championship, a global competition, began in 2008.

Alan Adler, an American engineer and Stanford University lecturer, invented the AeroPress in 2005. Adler is also known for inventing the Aerobie flying ring (1970s), which gave the product its company name.

Ground coffee is placed in a cylindrical chamber. Hot water is added, and the mixture steeps briefly (immersion phase). A paper filter is placed in the cap. The plunger is pressed down, creating air pressure that forces the brewed coffee through the filter and into the cup. The total brew time is very short, typically 1-2 minutes.

AeroPress combines immersion brewing with pressure-assisted extraction. During the immersion phase, soluble compounds dissolve in water. When the plunger is pressed, air pressure forces the liquid through the filter. The pressure also extracts additional compounds that gravity alone would not. The paper filter removes oils and fines, producing a clean cup. The short brew time limits over-extraction of bitter compounds.

The plunger creates pneumatic pressure that forces coffee through the filter. Unlike espresso, the pressure is relatively low (approximately 0.5-1 bar vs. espresso's 9 bar). The air pressure pushes liquid through the coffee bed and filter simultaneously.

Typical Extraction Yield: 18-22%. The short contact time and pressure combination typically yields extraction in the standard range.

Typical Strength (TDS): 1.2-1.5% TDS. AeroPress produces a concentrated brew, stronger than standard pour over but weaker than espresso.

• •Using water that is too hot, causing bitterness
• •Pressing too hard or too fast, which can cause channeling or spraying
• •Not using the AeroPress inverted method for recipes requiring longer steep times
• •Using a metal filter without realizing it changes the cup profile significantly
• •Forgetting to insert the filter cap before pressing

• •Pre-wet the paper filter to remove paper taste
• •Use the inverted method for brew times over 1 minute to prevent dripping
• •Experiment with water temperature: lower (80-85 C) reduces bitterness
• •Stir gently during the steep phase for even extraction
• •Press slowly and steadily for 20-30 seconds

• •The inverted method: assemble the AeroPress upside down to prevent dripping during steeping, then flip and press
• •Dilution (Americano style): brew a concentrate and dilute with hot water to desired strength
• •Cold brew AeroPress: use cold water and longer steep times (5-10 minutes) for a smooth cold brew
• •Multiple filters: use two paper filters for a cleaner cup or one paper + one metal for body with clarity

• •The AeroPress makes espresso. It does not. While it uses pressure, the pressure is far too low (about 1 bar) to produce true espresso (which requires 9 bar).
• •You must follow the included instructions. The AeroPress community has developed hundreds of alternative recipes that often produce better results than the official method.
• •Metal filters are always better. Metal filters produce a different (not better) cup with more body and oils. Paper filters produce a cleaner cup. It's a matter of preference.

The AeroPress is very easy to clean. After brewing, remove the filter cap and push the plunger to eject the coffee puck (grounds and filter) into the trash or compost. Rinse all parts with warm water. The rubber plunger seal should be periodically removed and cleaned underneath.

The rubber plunger seal can wear over time and should be replaced when it no longer creates a tight seal. The chamber can develop a coffee stain; soak in cafiza or baking soda solution to clean. Store with the plunger pushed fully through or removed to preserve the seal shape.

• •Chapter 3: Core Brewing Variables
• •Chapter 9: Espresso

• •Specialty Coffee Association
• •AeroPress Championships
• •Alan Adler / Aerobie