Bleached vs. Unbleached Paper Filters

One of the most enjoyable aspects of brewing coffee at home is how even the smallest details can change the taste of your cup. One of these is choosing a paper filter. There are two options you'll always find in grocery stores or on coffee equipment shelves: bleached (white) and unbleached (natural) .

While some coffee lovers say there's a "difference in taste," others see it as "simply an aesthetic and environmental issue." So, what's the truth? I wanted to do my own testing and share my observations.

1. What is a Bleached Paper Filter?

• Bleached filters are produced by bleaching natural brown paper using oxygen or chlorine treatments.

• Advantage: Clean appearance, more neutral odor.

• Disadvantage: The chemical process used in the production process may create a question mark for some coffee lovers.

2. What is an Unbleached Paper Filter?

• It retains its natural cellulose colour; it appears light brown.

• Advantage: A less processed, environmentally friendly production process.

• Disadvantage: The “paper smell” may transfer to the cup during the first use.

My Test 3: Two Different Brews, Side-by-Side Comparison

I did my experiments with the V60, using the same coffee (İmesta Coffee Luno filter series):

• Preparation: I pre-rinsed both filters with boiling water.

• Brewing: Same weight, same water, same time.

• Observation:

  • Bleached filter : A clean, clear cup; aromas are perceived more clearly.

  • Unbleached filter : There was a very slight "papery" aftertaste, but the body felt a bit more rounded.

4. Notes on Taste

• Bleached: Brighter, brings out the aromas.

• Unbleached: More natural, but a slight papery note can be felt (more noticeable if not rinsed well).

5. Environmental and Practical Aspects

• Unbleached filters are an environmentally friendly option as they undergo less processing.

• However, rinsing them thoroughly with hot water before use minimizes both odor and unpleasant tastes.

Conclusion: Which One to Choose?

There's no single "right" in the coffee world. My observation:

• If you are looking for a clearer and cleaner cup → Bleached filter.

• If you want to make a more environmentally friendly choice → Unbleached filter.

Ultimately, both do their job well; what matters is your palate.

☕️ That's the best part about experimenting: Even a small filter change can make a difference in your coffee experience.

👉 As I finish this post, let me ask you: Which filter do you prefer – bleached or unbleached?