Paper filters under the coffee puck reduce clogging of the portafilter/unifilter basket holes, thereby facilitating a more even extraction. It also prevents higher flow right at the basket holes, allowing more even water flow throughout the puck, especially in the bottom section. This enables the use of a finer grind, which increases extraction yield while keeping shot times the same. It does introduce an extra step, but the effort is rewarded with a perceptibly improved shot of espresso.

Specifications

• 100 filter papers per pack
• Made in Japan with premium coffee filter paper produced by the wet crepe method.
• Precision cut to fit the bottom of your portafilter perfectly.
• Available in 55mm (for standard 58mm and VST baskets)
• 0.15mm thickness