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MHW-3BOMBER RDT spray bottle

The MHW-3BOMBER RDT Spray Bottle is a refillable bottle for lightly dampening coffee beans before grinding. This helps limit static sticking during grinding. The bottle has a glass reservoir of approximately 10 ml and a spray head that twists away after use.
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€ 9,95
Variant

Only use RDT if your grinder permits lightly dampened beans. Spray the loose beans outside the grinder.

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About RDT Spray Bottle

Less coffee sticking.

You weigh your beans and grind them, yet coffee sticks to the grinder or collection cup walls. Static can be a cause. This spray bottle lets you spread a small amount of water over the beans before they enter the grinder, helping limit static sticking during grinding.
What is RDT?Show less

RDT stands for Ross Droplet Technique. Apply the method to weighed beans you will grind immediately. The bottle makes it easy to apply water as a fine mist, then sits closed beside your coffee equipment. Whether this extra step helps depends on your grinder, beans and how much static you experience.

What the RDT spray bottle adds

Limit static sticking while grinding.

The fine mist lightly dampens the outside of the beans. That small amount of water helps limit static build-up during grinding. This can reduce coffee particles sticking to the grinder and collection cup. Only use with a grinder suitable for RDT. Use as little water as needed.

A fine mist of water on whole beans before grinding

Twist the spray head away after use.

Twist the spray head out when you want to spray. Afterwards, twist it back into the housing. This keeps the nozzle covered when the bottle is on your worktop.

Twist-away spray head

Refill the reservoir.

The glass reservoir is removable so you can clean it and refill it with fresh drinking water. The slim bottle takes up little space beside your grinder or scale.

Approximately 10 ml · Removable glass reservoir · Approximately 105 × 20 mm

Why does a little water help?Show less

Breaking coffee beans and moving beans and particles against each other can generate an electrical charge. This can make particles stick to surfaces or attract each other. A small amount of moisture helps limit that charge. Retained coffee can also have other causes, such as grinding chamber shape or coffee oils. RDT therefore does not remove all coffee residue.

Is this right for me?

When coffee sticks through static.

RDT suits grinding separate, weighed portions. Treat only the beans for your next brew.

  • You grind one portion at a time.

    Weigh the dry beans, dampen them lightly and then grind them. You need a separate bowl or dosing cup for this. Do not dampen a supply of beans for later.

  • Your grinder permits RDT.

    Check the instructions for your model. If lightly dampening beans is discouraged or not confirmed, keep the beans dry and first ask what is suitable.

  • You want to tackle a specific problem.

    If little coffee sticks to your grinder or cup, this extra step may add little. If you already have a clean sprayer that applies very little water, you can keep using it.

How it works

Weigh first, then dampen lightly.

  1. 01

    Fill the bottle and weigh your beans.

    Fill the reservoir with fresh drinking water. Weigh the dry coffee beans into a clean bowl and place it beside the grinder, away from electrical parts.

  2. 02

    Apply a fine mist.

    Twist the spray head out and aim at the beans. Dampen them as lightly as possible, following your grinder's instructions. Avoid visible drops or water at the bottom of the bowl.

  3. 03

    Distribute the moisture.

    Gently shake the beans or stir them with a clean spoon. This spreads the small amount of water throughout the portion.

  4. 04

    Grind the beans.

    Put the lightly dampened beans into the grinder and grind them for your brew. Twist the spray head back into the housing and leave the bowl clean and dry.

How much water is enough?

Use the smallest amount that reduces static sticking and follows your grinder's instructions. The number of sprays needed depends on the amount of beans and how much water the spray head delivers. The beans do not need to be visibly wet.
Why not keep spraying?Show less

If coffee stays stuck, coffee oils or the grinder's construction may also be the cause. Extra water does not automatically solve that. Too much moisture can cause build-up instead. Check that the grinder is clean too and assess whether RDT makes a difference in your use.

Specifications

RDT spray bottle in detail.

Capacity and use

Reservoir capacity
10 ml
Contents
Drinkwater
When to use
On weighed whole beans, before grinding
Controls
Twist to open, press to spray

Material and variant

Reservoir
Removable and refillable, made of glass
Materials
Kunststof, aluminium en glas
Spray head
Wegdraaibaar in de behuizing
Colour
Zwart

Dimensions and weight

Dimensions
105 × 20 mm
Weight
25 g

What you receive

Your refillable RDT spray bottle.

Included with the RDT spray bottle

  • MHW-3BOMBER RDT spray bottle with spray head, housing and glass reservoir

What you need to add

Water, coffee beans and a clean bowl.

Frequently asked questions

What else would you like to know?

Ask a question about RDT Spray Bottle
Are one or two sprays always enough?

There is no fixed rule. The water per spray and portion of beans together determine how much moisture you add. Keep it very light and follow your grinder's instructions. More sprays do not automatically give a better result.

Can I spray directly into the grinder?

Spray the weighed beans in a separate bowl outside the grinder. Distribute the moisture, then put the beans into the grinder. This directs the mist onto the beans and keeps water away from parts that must stay dry.

What is the difference between RDT and WDT?

With RDT, you lightly dampen whole beans before grinding to limit static. With WDT, you distribute ground coffee in the filter basket using fine needles before tamping. Each technique has its own place in preparation.

Is RDT only for espresso?

Static sticking can also occur when grinding for filter coffee. Suitable use mainly depends on your grinder and the problem you want to reduce. Your brewing method alone does not make a grinder suitable for RDT.

How do I keep the spray bottle clean?

Remove the glass reservoir from the housing and clean it regularly. Rinse thoroughly with clean water and fill with fresh drinking water. Use a soft cloth on the outside and let the parts dry if you will not use the bottle for a while. Do not add fragrances or other substances to the water for your beans.