Filtration is the process in which solids are separated from fluids (liquids or gases) by pushing through an environment in which solids cannot pass, leaving only the liquid part on the other side.
When we brew coffee in an Aeropress, espresso machine, or an electric machine, the coffee goes through filtration. This part is essential to the process. In mechanical devices, the hot water pressure pushes the water through the ground coffee and the water comes out through a filter. This leaves us with a smooth coffee with no pieces of coffee in it. In this case, we use a reusable metal filter. It is very important to clean the filter after each use. The coffee left on the filter can have an impact on the final cup.
When water is manually poured into coffee, the method usually involves a paper filter that is not reusable. The coffee is placed on the filter and the hot water is lightly poured on the coffee.
These two methods are called drip coffee and molded coffee.
These different types of filtering leave us with different results. Filter coffee, with a finer filter, produces a much cleaner liquid, with almost no pieces of coffee and a much brighter taste. On the other hand, French espresso and press filters allow more coffee. The end result, in this case, is a darker, fuller, and fatter coffee.
The espresso machine can also have an impact on brewed coffee. Because the water stays in the metal device for quite some time, it can give the coffee a more acidic taste. That's why it's important to have a high-quality device with a smooth filter.
Filtration is usually the mechanical or physical operation that is used to separate solids from fluids by interposing an environment through which only the fluid can pass. Oversized solids in the fluid are retained, but the separation is not complete, and the solids will be contaminated with some fluid and the filtrate will contain fine particles.
In the coffee brewing process, filtration is an essential step in the process, as it allows the coffee grounds to be separated from the beverage. Almost all methods of making coffee use a kind of filtration. The most common filtering methods are the paper filter, the screen filter, and the filter basket. An example of a brewing method that does not use filtration is Turkish coffee.
The method of brewing coffee in which filtration plays a vital role in brewing beer is the preparation of filter coffee, the two main types of which are drip coffee and poured filter coffee. The French method of preparing the press uses a filter that only serves to filter larger particles. A filter holder is used to prepare the espresso. This filter would not be as good as a filter coffee maker, but it would be finer than a French press filter.
These different types of filtration give different results in the final cup. Filter coffee, with its finer filter, gives a much cleaner cup, without sediments and brighter taste notes. The course espresso and French press filters allow more properties from the coffee beans in the drink. Therefore, coffee made with these methods is darker, fuller, and more oily.