The Complete Guide to Chemex: Everything You Need to Know

The Complete Guide to Chemex

The Chemex brewer is a pour-over coffee maker distinguished by its hourglass shape, thick paper filters, and proprietary bonded glass construction. Invented by chemist Peter Schlumbohm in 1941, the Chemex is both a functional brewing device and a permanent design object in the Museum of Modern Art (MoMA) collection.

What Makes Chemex Different

Unlike a standard V60 or Kalita Wave, the Chemex uses thick, bonded paper filters (designed by the inventor) that remove both coffee oils and fine sediment. The result is an exceptionally clean, bright cup with minimal body, often described as tea-like in clarity. The filters are 20–30% heavier than standard pour-over filters, which slows drawdown and requires a coarser grind than a V60.

Chemex vs Other Pour-Over Brewers

The Chemex produces a distinctly different cup from a V60 or Kalita Wave. The thick filter paper removes many of the oils that contribute to body and mouthfeel, while the single-piece borosilicate glass construction does not absorb heat or flavor. This makes the Chemex particularly well-suited for light-roast coffees where delicate flavor notes—floral, citrus, berry—are the primary interest.

Recommended Brewing Parameters

• Coffee: 25–30g medium-coarse grind (similar to sea salt)
• Water: 400–500g at 200°F (93°C)
• Ratio: 1:15 to 1:17
• Brew time: 4–5 minutes
• Filter: Chemex bonded filters (natural or bleached, pre-folded)

Brewing Technique

1. Place the filter in the Chemex with the three-panel side facing the pouring spout
2. Rinse thoroughly with hot water, then discard the rinse water
3. Add ground coffee and level the bed
4. Bloom with 50g water for 35–45 seconds
5. Pour slowly in concentric circles, maintaining water level about 1cm above the bed
6. Allow the bed to drain completely; total brew time should be 4–5 minutes

VIHI's Perspective

At VIHI, we study filter geometry across all pour-over formats. The Chemex is a unique case because its filter paper is not just a consumable—it is an engineered component of the brewing system. The heavy bonded paper creates a specific extraction dynamic that is fundamentally different from the wave-style filters used in a Kalita Wave. Understanding these differences helps brewers choose the right tool for the coffee they want to highlight.