Here at Perfect Extraction, our goal is to demystify the world of specialty coffee, and part of doing so is defining our terms, especially those that may not be familiar to the average reader. Today’s term for definition is “WDT”, or Weiss Distribution Technique tool, used regularly by coffee aficionados in the espresso brewing process. The obvious question…what is a WDT tool, how is it used, and why does it benefit the espresso brewing process?
A WDT (Weiss Distribution Technique) tool is a specialized tool used in espresso making to improve the overall consistency of the espresso shot. It is a small, handheld tool that features a series of thin, pointed needles used to distribute coffee grounds evenly in the portafilter basket before tamping.
The WDT tool is used after grinding the coffee beans and before tamping. The needles of the WDT tool are inserted into the coffee grounds in a circular motion to break up any clumps and ensure that the grounds are evenly distributed throughout the basket.
By using a WDT tool, baristas can improve the consistency of the espresso shot by reducing channeling, which is when water finds a path of least resistance through the coffee puck, resulting in an uneven extraction. The WDT tool helps to ensure that the water flows evenly through the coffee puck, resulting in a more balanced extraction and a better-tasting espresso.
In short, the WDT tool is a simple yet effective tool that can make a significant difference in the quality of the espresso shot, so much so that you will be hard pressed to find a specialty shop where a WDT tool is not used by baristas passionate about crafting the perfect espresso shot.