Filter coffee

1. What is filter coffee?

Filter coffee is coffee brewed by pouring hot water over ground coffee through a filter. The method separates coffee grounds from the finished brew and produces a clean, clear cup.

Filter coffee is one of the most popular brewing methods worldwide. It is simple, reliable, and highlights the natural flavor notes of coffee without adding oils or sediment.

Filter coffee has a lighter body than espresso and highlights the coffee's fruitiness, acidity, and complexity. This makes it perfect for experiencing the unique characteristics of special beans.

2. Dosing and ratio - how much coffee should you use?

Dosing is the key to consistent and good filter coffee. The golden standard is 60 grams of coffee per liter of water, which equals a ratio of 1:16.7.

Dosing table

Adjust strength

The recommended ratio gives a balanced cup. If you prefer stronger or weaker coffee, you can adjust:

• Stronger coffee: Use 65-70g per liter (ratio 1:14 to 1:15)
• Weaker coffee: Use 50-55g per liter (ratio 1:18 to 1:20)

Avoid going below 50g per liter, as it produces thin and watery coffee. Over 70g can make the flavor bitter and overpowering.

3. Water temperature - the optimal range

Water temperature is crucial for correct extraction of flavor from coffee beans. Too hot water gives bitter taste, too cold water gives sour and underdeveloped flavor.

Why temperature matters

Hot water extracts flavor components faster and more efficiently. It affects the balance between sweetness, acidity, and bitterness in the finished cup.

• Below 90°C: Under-extraction - sour, flat, weak flavor
• 92-96°C: Optimal extraction - balanced, sweet, complex
• Above 97°C: Over-extraction - bitter, burnt, metallic taste

Manual control

If you're brewing manually with pour over, you can control temperature precisely:

1. Boil the water

   Bring water up to boiling point (100°C).

2. Let it cool

   Wait 30-45 seconds after boiling. This lowers temperature to approximately 93-95°C.

3. Use a thermometer

   If you want precision, invest in a coffee thermometer to measure water temperature.

4. Grind size - from coarse to fine

Grind size determines how quickly water can extract flavor from coffee beans. For filter coffee, medium to medium-fine grind is ideal.

Ground coffee should resemble coarse salt or sugar. Too fine grinding gives bitter taste and clogs the filter. Too coarse grinding gives weak, underdeveloped flavor.

Grind size by brew method

• Automatic drip coffee maker: Medium (like coarse salt)
• Pour over (Chemex): Medium to medium-coarse
• Pour over (V60): Medium to medium-fine
• French press: Coarse (like coarse sea salt)

Our recommendation

Royal Grinder - Hand Grinder

Swiss precision burrs provide uniform grinding for filter coffee. Perfect for pour over and drip machines.

• Material: Aluminum and steel
• Burrs: Conical burr, Switzerland
• Settings: 72 steps
• Price: 899,00 kr.

View productView product

Read more about grind size in our complete guide to grinding coffee beans.

5. Filters and materials - what's the difference?

Filter choice affects taste. There are three main types: paper filters, metal filters, and cloth filters. Each type has advantages and disadvantages.

Paper filters

Metal filters (gold filters)

Cloth filters

Cloth filters are a middle ground between paper and metal. They give cleaner taste than metal, but more body than paper. They are reusable but require careful cleaning.

What should you choose?

Choose paper filters if you prefer clean, clear taste and want to avoid sediment. Choose metal if you want more body and oils in your coffee, and if environmental considerations are important.

6. Brew methods - automatic vs. manual

There are two main approaches to filter coffee: automatic machines and manual methods. Both can make fantastic coffee if parameters are correct.

Automatic drip coffee maker

Automatic machines are easy and consistent. The best machines (like Moccamaster) deliver professional quality without hassle.

1. Fill water reservoir

   Use clean, fresh water. Avoid hard water if possible, as it negatively affects flavor.

2. Insert filter

   Place paper filter in the basket and rinse it with hot water.

3. Measure and grind coffee

   Use 60g per liter of water. Grind beans to medium fineness.

4. Start brewing

   Turn on the machine and wait 4-6 minutes for finished coffee.

5. Serve immediately

   Serve coffee within 20 minutes. After that it loses flavor and becomes bitter on the hot plate.

Manual pour over (V60, Chemex)

Manual brewing gives full control over all parameters. It requires more time, but the result can be exceptional.

1. Prepare equipment

   Place filter in the dripper, rinse with hot water, and discard rinse water.

2. Add coffee

   Pour 15g freshly ground coffee into the filter (for 250ml water).

3. Bloom phase

   Pour 30-40ml water over coffee and wait 30-45 seconds. Coffee will "bloom" and release CO2.

4. Pour in circles

   Pour remaining water in a slow, steady stream in circular motions. Avoid hitting filter directly.

5. Wait for drawdown

   Total brew time should be 2:30-3:30 minutes. Adjust grind size if it's too fast or slow.

7. Tips for better filter coffee

Here are five concrete tips to elevate your filter coffee from good to excellent.

1. Use freshly roasted beans

Coffee loses flavor 2-4 weeks after roasting. Buy beans from a local roastery that indicates roast date on the bag.

The Artisan

Specialty Coffee Roastery

"We roast coffee to order, so you always get beans with maximum freshness. Freshness is the difference between mediocre and exceptional filter coffee."

2. Use clean, fresh water

Coffee is 98% water. Water quality massively affects taste. Use filtered water if your tap water is hard or has chlorine taste.

3. Store beans correctly

Store coffee beans in an airtight container on the countertop. Avoid refrigerator or freezer, as moisture ruins flavor.

4. Clean machine regularly

Coffee machines accumulate coffee oil and scale over time. Descale every 3 months and clean basket after each use.

5. Experiment with coffee-water ratio

Start with the recommended 60g per liter, but adjust to taste. Some beans taste better with 55g, others with 65g.

8. Common mistakes - and how to avoid them

Even experienced coffee lovers make mistakes. Here are the most common problems and solutions.

Mistake 1: Coffee too old

Mistake 2: Wrong grind size

Too fine grinding gives bitter, over-extracted taste. Too coarse grinding gives sour, weak flavor.

Solution: Adjust grind size gradually. If coffee tastes bitter, grind coarser. If it tastes sour or weak, grind finer.

Mistake 3: Too little coffee

Many use too little coffee and get thin, watery taste. The correct ratio is 60g per liter, not 40-50g as many think.

Solution: Always measure coffee with a scale. Use the dosing table from section 2.

Mistake 4: Forgetting to rinse filter

Unrinsed paper filter gives paper taste in coffee and cools brew water down.

Solution: Always rinse filter with hot water before brewing. It takes 10 seconds and makes a huge difference.

Mistake 5: Letting coffee sit too long

Coffee on a hot plate becomes bitter after 20-30 minutes. Thermal carafes keep heat better without burning coffee.

Solution: Only brew what you need immediately, or pour coffee into a thermal carafe.