The paper filters can be used alone in the filter basket of the coffee machine. The same goes for a permanent coffee filter. But if you want to use a paper filter inside your permanent filter, you can, but it's not necessary. You're just doing more work for yourself and increasing the cost per cup.
The use of paper filters makes it quick and easy to dispose of ground coffee, since all you have to do is remove the used filter and the coffee grounds from the basket and throw them away. While some people prefer to use paper filters in their coffee maker and consider them to be better in terms of coffee flavor, permanent coffee filters are becoming very popular among consumers. Usually, paper towels are bleached with chlorine, which is then removed when you use the coffee maker. Although it is possible to use the coffee maker without a coffee filter, this can be potentially harmful.
The coffee will experience very little “double filtration”, if any, because the coffee is first filtered through the finer filter and then allowed to run through the slightly more porous filter, which will do nothing to the coffee that is already heavily filtered. We're here to inform you about whether or not you need to use a filter every time you use a coffee maker. Coffee drinkers have to make an important decision when choosing their coffee makers and preparing their coffee: to use permanent or paper coffee filters. Permanent coffee filters are usually the right size for most coffee makers, but to ensure the best fit, buy one designed for your particular coffee maker.
So spend a little more time on your routine to make sure your coffee maker is equipped with a filter. A suggested way to reduce it is to pre-wet the filter by pouring hot water through the filter and discarding the water, then adding the ground coffee to the filter and preparing the coffee. Coffee made with metal filters tends to have a darker color, a more intense flavor, and may have some coffee sediment at the bottom of the cup or pitcher. Using both filters means that the coffee is filtered twice and that can create a much weaker cup of coffee.
For example, you shouldn't use a paper filter with a permanent filter in most electric coffee makers.