Normcore RDT spray bottle 30 ml
One or two sprays on the beans before they go into the grinder – and the static charge noticeably eases. Less powder clinging to the chute and grinder, less of a dust cloud, less retention. A small tool that usually makes a big difference in the single dose ritual.
A refillable spray bottle for the Ross Droplet Technique, RDT for short.
What makes this spray bottle special
With the Ross Droplet Technique, the beans are moistened with one or two drops of water before grinding. This reduces the static charge that builds up during grinding – so less ground coffee stays stuck in the grinder and retention drops. The fine mist spreads the small amount of water evenly without soaking the beans.
Inside is a pure glass container, outside a black metal sleeve; the pump nozzle and cap are made of plastic. The bottle is refillable: unscrew the cap, top up with water, done. The glass and spray head have passed the tests of the TUV test centre under the European food contact directive, as well as FDA and ROHS.
At a glance
| Volume |
30 ml |
| Material |
Glass container inside, black metal sleeve, plastic pump nozzle |
| Function |
RDT – reduces static and retention when grinding |
| Dimensions |
Ø 3.2 cm × H 10.6 cm |
| Handling |
refillable, screw-off cap |
| Testing |
TUV, FDA, ROHS (food contact) |
Who it's for
For anyone who grinds single dose and wants to keep static in check – especially with grinders that tend to leave grounds behind. RDT isn't a must, but many find the chute cleaner afterwards. Every coffee journey is welcome with us.
What goes with it
RDT works hand in hand with the grinder – affordable and very good with the Varia VS3 or Comandante C40 from our coffee grinder collection, with a higher standard of materials at Weber Workshops. You'll find dosing cups, dosing funnels and WDT tools in our Normcore collection.
The machine to go with it – from single boiler to dual boiler – is in our coffee machine collection. If you're still deciding, try our advice tool.
Frequently asked questions about the Normcore RDT spray bottle
What does RDT mean?
RDT stands for Ross Droplet Technique. The beans are moistened with one or two drops of water before grinding to reduce static charge and, with it, ground coffee residue in the grinder.
What water can I use?
Ordinary tap water is enough. If you like, you can use filtered or distilled water.
Is the bottle refillable?
Yes, the cap screws off and you can refill the bottle with water.
Which grinders is RDT useful for?
In principle for all grinders, especially those that tend to build up static residue in single dose use. Even a very small amount of water is enough.
Roastery tip
A clean grind helps every bean. For dense, sweet espresso we like to reach for Cozy Chocolate and Nutty Delight. If you like it full and round without any acidity, stay with Very Nutty; for something fruity, Wild Peach goes into the grinder. That's our recommendation, one of many, and any bean you enjoy is the right one.
