Paper filters and puck screens

How paper filters and metal puck screens are used in espresso preparation to improve extraction, cleanliness, and consistency.

Coffee Basics Nerds
July 7, 2025
2 min read

Article 6 of 12 in Puck Preparation & Distribution/

Paper Filters in Espresso

Usage: Placed at the bottom of the basket (between puck and holes) or sometimes on top of the puck.
Benefits:
Reduces channeling by distributing flow evenly.
Filters out fines → cleaner cup, less sediment.
Improves clarity and sweetness in flavor.
Drawbacks:
Slightly reduces body (removes oils).
Adds cost and workflow steps.

Puck Screens

Design: Thin, perforated or mesh stainless steel discs placed on top of the coffee puck.
Benefits:
Distributes incoming water evenly across the puck surface.
Reduces erosion of puck surface during preinfusion.
Helps keep shower screen cleaner by blocking fines and oils.
Drawbacks:
Adds retention of small water volume (~1–2 g).
Must be cleaned thoroughly after each shot to avoid buildup.

Combined Use

Paper filter at bottom + puck screen on top → maximum cleanliness, reduced channeling, and improved consistency.
Common in high-end cafés and competitions where clarity and repeatability are prioritized.

Practical Tips

If using paper filters, pre-wet to avoid paper taste.
Keep puck screens dry and clean before use; rinse after each shot.
Adjust grind slightly finer if using both, since resistance increases.

Flavor Outcomes

Paper filters → brighter, cleaner cups.
Puck screens → improved consistency, fewer defects, slightly smoother extractions.
Both combined → most uniform flow and clarity, but may alter body.

Summary

Paper filters and puck screens are optional tools that enhance puck preparation. They improve water distribution, reduce channeling, and keep equipment cleaner—helping baristas achieve consistent, high-clarity espresso extractions.

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