The Ross Droplet Technique (RDT): The Definitive Guide
When it comes to getting the cleanest, most consistent coffee grind, it’s often the smallest of changes that make the biggest difference. One such change (now widely used by home baristas and professionals alike) is the Ross Droplet Technique, often known as RDT. Despite its scientific-sounding name, RDT is a simple and effective method for reducing static and improving grind quality - RDT is definitely a technique worth knowing.
What is the Ross Droplet Technique?
The Ross Droplet Technique was introduced by coffee enthusiast David Ross in the early 2000s. The method involves adding a small amount of water, typically just a few droplets, to your whole coffee beans before grinding. This tiny addition dramatically reduces static electricity, which is especially common when grinding light-roasted beans or using high-speed burr grinders.
Why it matters?
Static can cause coffee grounds to cling to grinder walls, chute interiors, and collection cups. This can affect the neatness of your grind station and can contribute to inconsistent dosing. RDT minimizes any mess and helps ensure that every gram of coffee you grind ends up where it belongs: in your brewer.
How to use the Ross Droplet Technique?
No need for fancy gear or special training: just a spray bottle (or even a damp spoon) and a consistent routine.
1. Measure Your Dose
We recommend weighing your beans before grinding as it is essential for consistency.
2. Add Water
Use 1-2 spritzes with a fine mist spray bottle. An alternative but slightly less elegant option is to dip a spoon in water and stir the beans gently. Make sure not to soak the beans.
3. Grind As Usual
Now grind your beans as you normally would. You’ll notice significantly less static and a cleaner workflow.
Why RDT Works
Coffee beans contain natural oils and compounds that can develop static when agitated—particularly during grinding. When static builds, ground coffee becomes charged and is more likely to cling to surfaces. Introducing a small amount of water changes the electrical conductivity, neutralizing the static charge. The result? A smoother, tidier grind with better retention accuracy.
When Should You Use RDT?
We recommend using RDT in all single dose grinding, including with all DF Grinders. It is particularly important in conditions where more static can be built up such:
- With light and medium roasts: These beans are often drier and more prone to static.
- On dry days or in low-humidity environments: Static issues are more pronounced when the air is dry.
DF Grinders are known for their low retention and high precision, but even the best grinders can benefit from RDT.
Myths and Considerations
Does it change the taste? No. Many tests and side-by-side comparisons have confirmed that such a small amount of water doesn’t alter the flavor or extraction of your coffee.
Will it damage my grinder? When used properly, RDT poses no risk. Just avoid over-saturating the beans or letting water pool in the grinder.
Is it necessary? While not mandatory, RDT is a low-effort technique that brings real benefits. For anyone who values a clean workflow and precise dosing, it’s totally worth it!
Our Recommendation
We highly recommend incorporating RDT into your coffee routine—especially when single-dosing with any of our DF models. It’s an easy, effective upgrade to your workflow that complements the design and performance of DF Grinders perfectly.
Looking for a perfect companion? We suggest pairing your DF grinder with our fine mist spray bottle for easy, repeatable RDT application. You’ll be amazed at the difference a droplet can make. Use our discount code RDTFORALL to get 30% off today!
