Use WDT Tool for Distribution

Goal

Use a WDT (Weiss Distribution Technique) tool to break up clumps and create even distribution before tamping.

What you need

• A WDT tool (fine needles, 0.3–0.4mm ideal)
• Your portafilter with ground coffee

Steps

1. After grinding into the portafilter, insert the WDT needles into the grounds.
2. Stir gently in circular motions, reaching all areas including edges.
3. Flatten the surface with a few passes near the top.
4. Tap the portafilter gently to settle, then tamp.

Why this works

Clumps create uneven density. Water takes the path of least resistance, flowing through looser areas (channels) while under-extracting dense spots. WDT creates uniform density throughout the puck.

Signs of improvement

• More even extraction (no spurts or blonde spots early)
• Better shot consistency from one pull to the next
• Reduced channeling visible on the bottomless portafilter

Tips

• Don't be too aggressive—you're distributing, not excavating.
• Clean your WDT tool occasionally to prevent buildup.