Does Filter Fit Really Matter in a V60 Brewing Cup?

A paper filter that sits flush against the walls of a V60 brewing cup matters more than many brewers expect. Experiments with the same dripper and coffee showed that a fully fitted filter drained noticeably faster than three poorly fitted setups, and the three loose ones all produced negative flavors. Loose paper also makes the dripper's ribs useless.

The fix takes only finger pressure and the force of a water stream, and it can raise the fit rate to roughly 95 percent. Rinsing the filter during the process also removes dust and paper odors, which matters for filters stored in the open. Pre-wetting remains optional, but for ribbed drippers the fit itself is not.

In pour-over coffee, there have always been two approaches regarding whether the paper filter needs to be pre-wetted. Not wetting the filter avoids the coffee grounds contacting the paper too early and affecting extraction, while wetting the filter washes away off-flavors and dust from the paper. But for a V60 dripper with plenty of flow-controlling ribs, the fit of the filter paper is especially critical—Front Street Coffee's experiments show that poor fit noticeably slows the flow rate and brings negative flavors. Building on an analysis of why fit matters, this article shares a simple, easy method that, using just finger pressure and the force of the water stream, can get a cone-shaped dripper's paper filter to fit at a rate as high as 95%.

Each approach has its advantages. Not pre-wetting the filter is meant to avoid the poured coffee grounds entering the extraction process before water is added, which would cause uneven extraction. Most Japanese-style brewing does not wet the filter paper (because they use flannel), the aim being to let the paper absorb the coffee liquid and then judge by its color distribution whether the extraction is even and whether it can move on to the next stage.

The benefit of pre-wetting the filter is that it washes away odors clinging to the paper. Some friends leave their filter papers exposed to the air for long periods, so fine dust easily sticks to them; soaking them in water to make them fit also rinses off this dust along the way.

However, for drippers with densely spaced ribs (such as the V60), how well the filter paper fits becomes quite important. Front Street Coffee once ran a set of comparison experiments, brewing coffee with V60 drippers in different states of filter fit, and found that the dripper with a fully fitted filter had a noticeably faster flow rate than the other three groups without a proper fit.

(Direct link to the experiment: Is filter paper fit really that important for pour-over coffee?)

The same holds true for flavor. Apart from the cup with the properly fitted filter, the other three groups all showed negative flavors due to poor fit. So for drippers with ribs, the degree of fit cannot be ignored—it not only genuinely affects the taste, but when the filter paper doesn't fit well, the dripper's ribs are rendered useless.

Don't worry, Front Street Coffee is here, no surprises! Today we'll share a method that can get the filter paper to fit at a rate as high as 95%, easily solving the fit problem, and it works for any cone-shaped dripper.

First, still follow the standard procedure and fold the filter paper first.

Next comes the key step: place the folded filter paper into the dripper, then use your index finger and thumb to gently press down from above on the fold line of the paper and the position opposite it.

Pour in a strong stream of water, straight up to two-thirds of the dripper. The finger pressure ensures the filter paper won't shift while pouring, and the water pressure forces the paper to cling tightly to the inner wall of the dripper.

Ta-da! The filter paper fits perfectly just like that, simple and practical. The only small drawback is that it uses a fair amount of water, but it truly maximizes how well the filter paper fits. Hurry and get out your pour-over kit and give it a try.

- END - Front Street Coffee

No. 10, Bao'an Qian Street, Yandun Road, Dongshankou, Yuexiu District, Guangzhou, Guangdong Province

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