Order and pay at Barista Essentials

8 ml RDT spray – reduce static cling when grinding coffee

Does ground coffee stick to your grinder's outlet or scatter around the collection area? This refillable RDT spray lets you apply a very light mist of water to your portion of beans before grinding. This can reduce static charge. The glass bottle has an 8 ml capacity and comes in a protective black holder.

Helps reduce static cling during grinding
Refillable 8 ml glass reservoir
Protective ABS holder

€9,95

Sale Sold out

Taxes included. Shipping calculated at checkout.

You order from Barista Essentials, which handles payment, delivery, returns and the right of withdrawal. De Barista Shop may receive a commission through this link; you pay nothing extra.

View full details

Key specifications

Brand
Barista Essentials
Product type
Refillable RDT spray for coffee beans
Size / Content
Refillable RDT spray for coffee beans
Suitable for
Before use, check whether your standalone grinder's manufacturer permits RDT. Spray only onto a weighed portion of loose beans outside the appliance. Never spray water directly into the grinder, hopper or espresso machine. Barista Essentials does not specify compatibility with particular machine models.
Material / finish
Glass reservoir with ABS holder
Cleaning / Maintenance
Barista Essentials describes the bottle as refillable and easy to clean. Barista Essentials does not specify a cleaning method or whether it is dishwasher-safe. Use clean water and follow the supplied care instructions; do not assume it can go in the dishwasher.
Colour
Black
Package contents
RDT spray with an 8 ml glass reservoir and protective ABS holder. A dosing tray is sold separately.

Why this helps make better coffee

Grinding can generate static electricity. This can make ground coffee stick to surfaces or scatter beside your collection cup. It is especially inconvenient when you weigh out a portion of beans for each drink: you want to collect your dose neatly and keep your worktop clean.

RDT stands for Ross Droplet Technique: you very lightly moisten a weighed portion of coffee beans before grinding. This spray bottle helps distribute water as a fine mist. That can reduce static cling; the difference you notice depends on your beans, grinder and surroundings, among other factors. It does not solve every cause of coffee retention in a grinder.

A small step that can help you collect your weighed coffee more neatly.

Zwarte RDT Spray van Barista Essentials op een witte achtergrond

Who is this suitable for?

For home baristas who weigh out one portion of beans at a time and experience static cling during grinding. Use the bottle on loose beans in a tray outside the grinder. The compact reservoir is refillable; the holder protects the glass during normal use.

View at Barista Essentials

For whom is this not necessary?

Not a logical first purchase if static coffee is rarely a problem. Do not use this method with a bean-to-cup machine, a filled bean hopper or a grinder whose manufacturer advises against moist beans. For inconsistent flavour, fresh beans, a suitable grind size and consistent dosing remain more important starting points.

Does this fit your machine, routine or use?

Compatibility
The spray does not need to fit your machine or portafilter. Whether you can use RDT depends on your grinder's instructions. A description such as universal does not prove that every grinder or bean-to-cup machine can handle lightly moistened beans.
Size
8 ml
Machines and painters
Standalone coffee grinder for single dosing, provided the manufacturer permits RDT
Specifications
Standalone coffee grinder for single dosing, provided the manufacturer permits RDT

Privé barista coaching aan huis door Geert-Jan van der Molen, waarbij espresso technieken worden uitgelegd en geproefd tijdens een persoonlijke koffie training.

Advice from Geert-Jan the Barista Man

With over 10 years of experience in providing barista workshops at home, at businesses, and in Amsterdam, Geert-Jan is happy to share his advice.

Who is Geert-Jan?

From practice:

This buying guidance is based on the product specifications and how RDT is used. It does not claim that Geert-Jan de Baristaman has personally tested this particular bottle.

My advice:

Geert-Jan de Baristaman's advice: choose this spray if static cling is a specific problem in your single-dosing routine. Keep your dose and grind size consistent at first so you can assess whether this extra step helps. Do not expect guaranteed better espresso: the bottle mainly supports bean preparation.

Zwarte RDT-spray in een hand met een vinger op de verstuifknop

Here's how to use this in your coffee routine

A barista tool only really works well when you know where it fits into your routine.

Get into the routine:

After weighing your beans, before grinding

Usage:

After weighing your beans, before grinding

Geert-Jan's tip:

A wide tray helps distribute the mist over the beans. The Coffee Dosing Tray is a suitable addition. Keep your recipe and method consistent when assessing the effect on static cling.

You can view the Coffee Dosing Tray for weighing and transferring your beans.

View at Barista Essentials

Note:

View at Barista Essentials

Common mistake

View at Barista Essentials

More control over your espresso

A useful tool supports your routine. These modules also teach you why dosing, beans and preparation make a difference.

Online barista module espressomachine reinigen en onderhoud stappenplan

Learn to assess dosing, grinding and extraction together; the spray does not replace these basics.

Cleaning and maintenance – Protect the taste and your espresso machine

€4,95

Review this module

Online barista module drie gouden regels voor goede espresso zetten

Understand why bean freshness matters, even when you follow a consistent single-dosing routine.

The 3 Golden Rules of Espresso – Why Your Shots Keep Changing (and How to Stop It)

€4,95

Review this module

Frequently Asked Questions

Where can I order this product?

The button takes you to Barista Essentials. You place and pay for your order there; Barista Essentials also handles delivery, returns and withdrawal rights. Check the current price, availability and terms with the seller.

Do I pay extra when using De Barista Shop's link?

No. De Barista Shop may receive a commission when you order through our link. This does not cost you anything extra.

Can I use the RDT Spray with any coffee grinder?

Not necessarily. Check your grinder manufacturer's instructions. The bottle size does not impose any portafilter requirements, but that does not make the technique suitable for every machine. Use RDT only if lightly moistened beans are permitted.

How do I use the RDT Spray without adding too much water?

Apply only a very light mist to a weighed portion of loose beans, outside the grinder. Shake the beans to distribute the moisture and grind immediately. The beans should not be dripping wet. Always follow your grinder manufacturer's instructions.

When is an RDT Spray not the best first choice?

When you have no problem with static cling or your grinder does not allow lightly moistened beans. If your espresso results vary, start with fresh beans, dosing and grind size. This spray is not a substitute for those fundamentals.

I have another question

You can always contact Geert-Jan de Baristaman

Want to reduce static cling when grinding?

View at Barista Essentials

You order directly from Barista Essentials. Find the current price, availability and terms of sale there.

Country/region

Language

8 ml RDT spray – reduce static cling when grinding coffee