What Material Are Coffee Filters Actually Made Of?

Coffee filters are made of paper pulp, sold as bleached white or unbleached natural versions. Melitta Bentz created the first paper filter in Dresden using pages from her son's exercise book set in a pierced copper bowl, and she founded Melitta in 1908 to manufacture drippers and filters; by 1937 the company's dripper shape became the familiar prototype.

Bleached filters give a fainter paper pulp smell and a purer cup, but many makers still use chlorine, which can pollute the environment if mishandled. Unbleached filters avoid that, though they can leave a papery taste. In the beverage filter paper market, well-known brands have shifted to oxygen-based bleaching or fluorescent-agent-free processes, and some use bamboo fiber.

When brewing pour-over coffee, the paper filter plays an indispensable role—but do you know its origins and types? Filters on the market come in bleached white and unbleached natural versions, each with its own trade-offs in terms of taste, environmental friendliness, and health. From Front Street Coffee's perspective, this article introduces the origins of paper filters, the pros and cons of bleached versus unbleached, explains the appropriate dosage for different filter sizes, and finally offers purchasing advice to help you find the one that best suits your brewing habits.

Every time you brew coffee, you always start by taking a paper filter, folding it, and placing it in the dripper, then adding the coffee grounds. What exactly does this paper filter do? And why do filters on the market come in white and natural wood colors—which one is actually better? What differences exist between the two?

Front Street Coffee is here to talk about these questions. Let's start with the basic concept of the paper filter.

The Origins of the Paper Filter

The paper filter was born in a small German town called Dresden. A lady named Melitta Bentz used pages from her son's exercise book as a filter, placing them in a copper bowl with holes punched in it to serve as a dripper, and thus extracted coffee. In fact, before paper filtration came along, people generally used rags to filter coffee, and compared to rags, paper material can more effectively filter out off-flavors.

So Melitta Bentz founded the Melitta company in 1908 and began manufacturing improved drippers and paper filters. In 1937, the dripper style invented by the company became the prototype of the dripper shape we are familiar with today.

The Pros and Cons of Bleached vs. Unbleached Filters

Filters on the market fall into two categories, bleached and unbleached—do they affect your health? The manufacture of paper filters is itself a science; below we list the differences between the two types of filters:

Bleached Filters

Pros:

1. The paper pulp smell is fainter, and the coffee flavor is purer. Cons:

1. Many manufacturers still use "chlorine" for bleaching, which can cause environmental pollution if not handled properly.

However, in recent years many well-known brands have switched to oxygen-based bleaching or fluorescent-agent-free eco-friendly processes, and some make bamboo fiber filters from bamboo, which is both environmentally friendly and gives consumers peace of mind.

Unbleached Filters

Pros:

1. The manufacturing process is relatively simple and more environmentally friendly.

Cons:

1. If you don't rinse the filter with hot water, a papery taste may remain in the coffee. Although there is no hard rule that unbleached filters must be rinsed before brewing, if you want to brew good coffee and aren't particular about the flavor of each cup, it's hard to improve further. In addition, some professional baristas also use alternating hot and cold rinses to remove the filter's off-odor and keep the coffee flavor pure.

What Sizes Do Paper Filters Come In?

Generally, filters are divided into the following two types:

1–2 Servings

A single serving of coffee grounds is about 10 grams, so this type of filter can hold up to 20 grams of coffee grounds.

3–5 Servings

You can brew more coffee grounds at once, and the paper area of the filter is also larger. Which Filter Should You Choose?

If you care about the environment, unbleached filters are naturally the first choice—just rinse with hot water once or twice and the papery taste can likewise be removed.

If you want to skip the step of rinsing with hot water to remove the odor, you can also choose oxygen-bleached filters, which are more environmentally friendly. Ultimately, with paper filters you get what you pay for: the better the quality, the higher the price, but correspondingly, the pulp smell will be much fainter than that of cheap filters.

The above content is compiled by CoffeeHunters, a coffee news website.