Filter Coffee Machine

A filter coffee machine (or drip coffee maker) is an often electric kitchen appliance that brews coffee by heating water, passing it through ground coffee and a filter, and dripping the finished brew into a carafe. 

What you need

Essential Equipment:

• Electric Filter Coffee Machine: Features a water reservoir, heating element, filter basket, and carafe (glass or thermal).
• Coffee Filters: Paper filters (usually size 4) or a permanent/reusable filter to hold the grounds.
• Coffee Grounds: Medium-ground coffee beans, ideally fresh.
• Water: Cold, filtered water to prevent chlorine flavour taints and reduce limescale buildup. 

Recommended Accessories:

• Coffee Grinder: A burr grinder is preferred for consistent, medium-sized grounds, resulting in better, fresher flavour.
• Digital Scales: For weighing both coffee and water to achieve an accurate, consistent brew ratio (e.g., 60g per litre).
• Kettle: Useful for heating water to pre-warm the glass carafe to keep coffee hot longer.
• Cleaning Supplies: Descaler or specialised cleaner to remove coffee oils and residues. 

Filter Coffee Machine Recipe

• Brew Time: 5–8 minutes
• Coffee: 30g
• Water: 500g (500ml) filtered water
• Grind Size: Medium-coarse (similar to sea salt)

Instructions

• Prepare the filter: Place a paper filter in the basket and rinse it with hot water to remove any paper taste, and warm the machine.
• Measure Coffee: Use 60g of medium-ground coffee for a full 1-litre brew (or scale down to 30g for a 500ml brew). If coffee is too weak, use more coffee or grind finer.
• Pour/Brew: Add water to the reservoir, start the machine.
• Optional "Bloom" (For manual control): If your machine allows, briefly pause the brewing after the water wets the grounds to let it "bloom" for 30-45 seconds. This releases gases and improves flavour.
• Finish: Once dripping stops, do not leave the coffee on the warming plate for more than 20 minutes, as it will become bitter and burnt. Use a thermal carafe if possible.

Dial it in

Start with a consistent, standard recipe to see how the machine performs. 

• Ratio: Use a starting ratio of 1 gram of coffee to 16–18 ml of water.
• Grind Size: Aim for a medium-coarse grind, similar to sea salt.

If the coffee doesn't taste right, adjust one variable at a time. 

• Too Weak/Sour (Under-extracted): The water passed through too quickly. Solution: Make your grind finer.
• Too Bitter/Ashy (Over-extracted): The water passed through too slowly. Solution: Make your grind coarser.
• Temperature: For lighter roasts, higher temperatures (96°C+) are better; for darker roasts, lower temperatures (87-93°C) are better. 
• Coffee Amount: A common starting point is 60-70g of coffee per 1 litre of water.

Compare methods

Functionality

Paper Filters

Paper filters give you a cleaner, lighter cup. They catch all those fine particles and oils, so you get a bright, acidic coffee without any sediment at the bottom. The filter shape actually influences your coffee's volatile profile more than the material itself. So yeah, geometry matters. The downside is that they are not great for the planet, and you keep having to buy them.

A few things to know about paper filters:

• Storage: Store them in an airtight container away from smells. The paper is super porous and absorbs odours like crazy. Treat them like you treat your beans.
• White vs Brown: White filters are bleached to remove lignin (the stuff that makes paper yellow). Brown filters skip this step, which means less processing and is better for the environment, but you'll need to rinse them more thoroughly to avoid that papery taste in your cup.
• Thickness: The thicker the filter, the more oils get separated from your final drink. Translation: thicker filters = cleaner, less "coarse" flavour.
• Creping (that ruffled texture): This increases surface area and prevents the filter from clogging with fines (a problem called "muddying," where all the pores get blocked and your drawdown stops).

There are actually two types of creping:

1. Two-sided crepe: Both sides are textured, giving you consistent, faster flow and better extraction
2. One-sided crepe: Textured outside, smooth inside. This restricts flow slightly for more immersion and a slower, more aromatic extraction (great for light roasts).

• Fluted edges: Those wave-shaped edges on flat-bed filters are there to keep the sides from collapsing when wet (Pro tip: when pre-wetting, pour water into the centre and avoid hitting the sidewalls directly, or you'll lose the shape).
• Wet strength: Ever wonder why coffee filters don't disintegrate like newspaper? They're treated with food-grade wet strength resins that create a protective layer around the fibres. Chemistry keeps your brew from turning into soggy mush.
• The health angle: Paper filters trap diterpenes like cafestol, which some studies link to raised cholesterol.

Metal Filters

Metal filters let coffee oils through, giving you a heavier, richer, more intense brew. You'll notice more body and a bolder flavour. The volatile profile is actually different from paper-filtered coffee - it's not just about texture, the aromatics change too. The trade-off is you'll get some fine sediment at the bottom of your cup - that silty "mud" some people love, and others hate. The big win with metal filters is that they're reusable, so no waste and nothing to repurchase. Just wash and go.

Brief History

Back in the early 1900s, making coffee was a messy affair. People either boiled the grounds directly in water or used linen bags, and the result was usually bitter and gritty. Then, in 1908, a German housewife named Melitta Bentz had enough of the mess. She grabbed her son's notebook, some blotting paper, and a brass pot with holes, and invented the first paper coffee filter. Her simple idea cleaned up the brew and kicked off the whole pour-over revolution we know today.