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SKU kruve
System Sieves for Coffee
Kruve System Sieves for Coffee

155.00€ 125.00€ Without Vat
Not in stock
Phone delivery +30 2741 027 446
Free shipping With purchases over 100€
Phone delivery +30 2741 027 446
Free shipping With purchases over 100€

Fines refer to super finely crushed coffee particles that have the consistency of powder. Fines are unfortunately created by even the best grinders on the market. When brewing, these unwanted fines over-extract, giving your coffee a bitter flavour.




Fines - As seen under a microscope



Boulders are particles that are larger than your desired grind size. These boulders negatively impact the taste of your coffee because an under-extracted particle releases sour flavors.

The RAFINO's patent-pending sieve system removes both Fines and Boulders, leaving you with just the grind you need to make a great tasting coffee.

                                                    Separating Your Grinds with Micron-Level Precision


The RAFINO gives you full control over your grind size. With the RAFINO, you can customize your coffee recipe down to a precise micron range. Use only the grinds you want! Nothing bigger, and nothing smaller, e.g. 400-800μm, 500-700μm.

The RAFINO offers eight interchangeable and easy-to-clean sieve sizes ranging from 300 to 1000 microns in 100 micron intervals.

The interchangeable sieves provide 28 different grind size combinations! That's true refinement.


The sieves give you full control over your grind and let you specify the appropriate grind size, down to the micron...

Refined Grinds of Various Sizes

Many factors can affect the flavor of your coffee, such as the roast, grind size, water temperature, coffee-to-water ratio, extraction time, and so on. Of all the variables we studied, we found that few impacted flavor as much as grind consistency.

When brewing coffee, you want every particle to be the same size so that you can get an even extraction. When you have an uneven grind, the large pieces get under-extracted while the small particles get over-extracted, giving your coffee an unwanted bitter flavor.

 Don't throw out those grinds! Boulders can be put back in your grinder and be re-ground and unwanted fines can be re-purposed

in a variety of ways. For example, you can use them in baking, cooking, cleaning, or even gardening. The grinds are also biodegradable,

so if need be, can go in the compost bin.

The great thing about the RAFINO is that it will help you calibrate your grinder and minimize excess. For example, if you make

a coffee every day for a week, then at the end of that week, you should only have about a tablespoon of excess. 

Most importantly, if you geek out about coffee like we do, then you will care about the details. We spend time, money, and effort


getting the right flavour because that's what matters most. To us, every cup of coffee that isn't made as good as it can be is a waste.

As any wise chef will tell you, if you want a perfectly cooked meal, you must chop your ingredients in equal sizes. A mix of sizes means

the larger pieces will be under-cooked and the smaller pieces will be over-cooked or burnt. Your coffee grind is no different.

Evenly Chopped Food = Evenly Cooked Meal


While we're on the topic of cooking, don't throw out those grinds! While the fines are not desirable in your brew, they are still

great for many other uses. Save those fines for baking, cooking, compost, or even facial peeling scrubs.

If you're serious about coffee, you have to be serious about consistency and with the RAFINO, No matter what micron range you

select, you can be assured the grounds will be consistent. Consistent grinds allow for an incredibly even extraction, and in turn,

an incredibly rich flavor.

Award-winning Barista Champion Matt Perger has written extensively about the importance of getting an even extraction.

He even wrote a blog about consistency titled, "The Most Important Thing About Brewing Coffee".

Don't ruin a good roast with a bad brew. If you are investing your time and money to get things just right, then you cannot afford to overlook consistency.

The problem with grinders is they can adjust grind size, but not grind consistency. When coffee is ground in even the best ceramic

burr grinders, the beans do not crack or grind evenly. In fact, they shatter like glass into thousands of pieces, both big and small.

Results from a high quality grinder

 Another important point is that grinders use arbitrary dials that don’t correspond to any fixed size. The RAFINO gives you full

control of your grind range via precision-made, interchangeable sieves of fixed sizes.

By no means, does the RAFINO replace your grinder. In fact, using the the RAFINO's patent-pending sieve system helps you

to calibrate your grinder.

You might have a certain brew method and/or coffee recipe that calls for a particular grind range. Maybe you prefer to create

or refine your own recipe? With the RAFINO, anything is possible.

No matter what grind size a brew method calls for, the RAFINO will give you that exact size. Nothing bigger, and more importantly,

nothing smaller. You get a truly even grind within your desired micron range.

The RAFINO works great with Cold Brew, Drip, Pour Over, Press, Stove-top Coffee, Espresso, and many others!

The RAFINO improves your grind, no matter the brew method

We have used many of the best grinders on the market, yet we were never quite satisfied with the consistency they delivered,

especially at the coarser settings. From there, we began our search for something better. We started experimenting with

industrial-grade hand-held sieves (typically used to measure particle distribution in laboratory settings). We tried pouring our

coffee grounds in those massive sieves and we were blown away by the results. It didn't take long before we were slamming

coffee cups on the counter, challenging each other to side-by-side taste tests.



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