Studio Barista RDT Spray Bottle

Sprinkling a little water on the coffee beans before grinding them is a technique known as RDT (Ross Drop Technique), and it has a surprisingly practical advantage:

Main advantage: less static electricity, less mess

When grinding dry coffee beans, especially if they are light roast or in low-humidity environments, static electricity builds up.

This causes:

• The beans to stick to the walls of the grinder

• Coffee to splatter everywhere

• Lumps of clumpy, unevenly ground coffee

• Adding just one or two drops of water reduces that static electricity.

The result:

• A cleaner grind (less mess on the countertop)

• A more even distribution of ground coffee

• Less waste (ground coffee doesn’t get trapped inside the grinder)