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I saw a picture of this method being used in a magazine from Hong Kong. A cafe gave a short description of brewing with a moka pot. They placed a small, circular, paper filter on top of the ground coffee before screwing on the top of the pot.

Why they would they have added this unconventional step to moka pot brewing? Does the finer filter aid in pseudo-crema production? Does it produce a cleaner brew?

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Do you have a moka pot and coffee filters? Sounds like a fun experiment. Unfortunately I'm in a long distance with my boyfriend who just got a moka pot for Christmas or I'd try it myself! – lemontwist Jan 8 '13 at 11:48

Moka pots are essentially percolators meant for making espresso. As such, they are normally fitted with metal filters inside the pot that are capable of filtering some sediment, but not oils or Diterpenes (such as Cafestol). Diterpenes have been implicated in cholesterol increases associated with unfiltered coffee, but may also have cancer- and parkinson's-fighting properties.

The paper filter will also have a large effect on the flavor of the coffee produced. Paper filters are designed to remove oils from coffee, but the oils removed by the paper filter can be a substantial source of flavor for the coffee produced, as many of the flavor compounds in coffee are fat-soluble.

Coffee produced with a paper filter will have less sediment, fewer oils and, in the opinion of many metal-filtered enthusiasts (myself included), a more even, less robust flavor. That shouldn't be regarded as an inherent downside, however, as many people prefer the flavor of paper-filtered coffee, finding the mellower profile and lack of sediment/oilyness preferable. Crema is more pronounced in metal-filtered than in paper-filtered coffee.

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For people with high cholesterol, there may be some benefits to doing this (if you believe that Diterpenes increase LDL). The paper filter can remove most of the Diterpenes from the ground coffee. It should also decrease any fine coffee sediment you get in the resulting coffee

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I pour the coffee after mokapot into a filtered coffee dripper. The oil and other material left behind the filter. The smell of the filtered coffee is fresh bit caramel and smell of the oil and other residu left behind the filter is bad

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