MHW-3BOMBER RDT Spray Bottle – less static when grinding
A quick twist, and the nozzle emerges from the body. One spray lays a fine mist over the beans, you swirl them once in the cup, and into the grinder they go. Afterwards less coffee sticks to the spout, and less powder ends up on the counter. The RDT Spray Bottle by MHW-3BOMBER is a small tool from our grinder accessories for a cleaner grind.
RDT stands for Ross Droplet Technique. When grinding, the coffee becomes statically charged; it then clings to the spout and walls or flies off when you transfer it. A little water on the surface of the beans reduces this charge. The bottle holds around 10 ml and is around 20 mm slim; the body is made of ABS and electroplated aluminium, the water reservoir of glass.
Features
Fine mist
The bottle releases a soft, even mist that reduces static charge during grinding. According to the manufacturer, this means fewer clumps and less flying coffee, a more consistent grind and less waste.
Recessed nozzle with twist mechanism
The nozzle is recessed in the body. Turned clockwise it comes out, turned anticlockwise it disappears again. This keeps it protected from dust, and the closed bottle looks clean and simple.
Detachable for cleaning
All parts can be removed, so you can clean the bottle thoroughly. We recommend filling it with fresh water and changing the water regularly.
Robust body
The bottle is made of ABS, electroplated aluminium and glass. The manufacturer describes the body as shock-resistant, wear-resistant and corrosion-resistant.
How to use RDT
Put the weighed beans in a cup or dosing tray, twist out the nozzle and spray over the beans. Swirl or stir briefly, then grind as usual. In our experience one or two sprays per dose are enough: the beans should only be lightly moistened, not wet.
The manufacturer describes RDT mainly for flat burr and blade grinders and advises against it for conical burr grinders. How well it works on your grinder shows in everyday use.
10 ml or 30 ml?
At around 10 ml and around 25 g, the MHW-3BOMBER bottle is small and light and fits easily next to the grinder. If you prefer to keep more water in reserve, you will find an RDT spray bottle with 30 ml in our Normcore collection.
At a glance
| Brand |
MHW-3BOMBER |
| Type |
RDT spray bottle |
| Colour |
Black |
| Volume |
Around 10 ml |
| Material |
ABS, electroplated aluminium, glass |
| Nozzle |
Recessed, extends with a twist |
| Dimensions |
Around 20 × 105 mm (diameter × height) |
| Weight |
Around 25 g |
| Cleaning |
All parts removable |
| Origin |
China |
| In the box |
1 RDT spray bottle |
Who it’s made for
For anyone who single doses and weighs their beans before grinding. For grinders where coffee clings to the spout or flies around when you transfer it. And for anyone who would like to clean less at the coffee bar. Our advice tool helps you narrow down which grinder suits your routine.
What goes with it
A WDT tool helps against clumps in the portafilter, for example the Lightning WDT Tool 2.0 from our MHW-3BOMBER collection. You will find more accessories under grinder accessories and spare parts and barista equipment, and freshly roasted beans under coffee beans.
Frequently asked questions
What does RDT mean?
RDT stands for Ross Droplet Technique. You spray the beans with a little water before grinding to reduce static charge during grinding.
How much water does the spray bottle hold?
Around 10 ml. In our experience that is enough for many doses before you need to refill.
How often should I spray?
In our experience one or two sprays per dose are enough. The beans should only be lightly moistened, not wet.
What is the bottle made of?
The bottle is made of ABS, electroplated aluminium and glass. The nozzle is recessed and comes out with a twist.
How quickly will the spray bottle be delivered?
Delivery takes 2–5 working days, throughout Switzerland and to Liechtenstein. Click-and-Collect is available in Bern and Zurich.
Can I get advice before buying?
Yes. In our showrooms in Bern (Gerberngasse 44) and Zurich Oerlikon (Hagenholzstrasse 50b) we are happy to advise you on grinder accessories and the right coffee.
Tip from the roastery: In our experience RDT shows the clearest effect with light roasts, because more coffee often clings to the spout when grinding them. For most espressos we recommend Cozy Chocolate and Nutty Delight, and Very Nutty for maximum body. If you would like to discover a light, fruity roast, Wild Peach is an addition where one spray is particularly worthwhile. That is our recommendation, one of many.
