Problem Cause
Uneven Puck Distribution
Coffee grounds are unevenly distributed in the basket, causing channeling
How to Identify This Issue
- 1Side spraying during extraction
- 2Uneven wet spots on puck
- 3Inconsistent shot times
- 4Sour and bitter notes together
- 5Visible channels in spent puck
Visual Cues
Ground texture and uniformity
Puck surface and distribution
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Solutions for Uneven Puck Distribution
Use WDT Tool for Distribution
Use a WDT (Weiss Distribution Technique) tool to break up clumps and evenly distribute grounds in your portafilter before tamping.
Expected Result
Eliminated channeling, more even extraction, consistent shot times.
Ensure Level Tamping
Apply even, level pressure when tamping. Use a leveling tamper or practice keeping your wrist straight and elbow at 90 degrees.
Expected Result
Even extraction across the puck, eliminated side channeling, consistent flavor.
Use Precision Filter Basket
Replace your stock filter basket with a precision basket like VST, IMS, or Pullman. These have more consistent hole sizes.
Expected Result
More even extraction, better flow, reduced channeling potential.