Firstly we want to direct your attention to a couple reviews on the Kruve that are from a slightly different perspective than ours and really worth checking out.
- A James Hoffman video and
- A written review/conversation thread on Home Barista called Taste Impact of Fines.
For our review we will mostly focus on using the Kruve sifter for indexing a coffee grinder in a commercial coffee business setting.
Full disclosure: Kruve requested we review their sifter. We do not receive or solicit any kind of return for our reviews, financial or otherwise. We are a school - not a reseller.
Ground coffee is not spherical, it won’t fit obediently through the Kruve as assumed.The Kruve sifter is not 100% exact in its separation method since some coffee when shaken will fall on its side and not go through the sifter and other grinds will fall on their ends and go through the sifter. This is all self evident and mentioned for accuracy.
How do you index a coffee grinder with a Kruve? A: we suggest you take two of the filters. One at 500 microns and the other at 1000 microns and sift ground coffee for 60 seconds until you have 70 - 75 % of your grinds stay in the upper chamber. Make note of the dial number on your grinder - this will be your cupping grind size going forward.
Why is it important to index a coffee grinder? A: Firstly, to insure your grinder does not skew your cupping results over time. Secondly, to be used for an early indicator of burr wear and lastly the Kruve sifter can be used to purchase your new or used grinder.
How would a coffee grinder skew cupping results?
Dials on most grinders are not refined enough for repeatability. Indexing your grinders will make sure you are not going by some random number on a dial on your grinders, but actually going by a calibrated particle size when cupping your roasted coffee which you may possibly be using this cupping result to further determine purchasing green coffee.
How to use the Kruve to test grinder burr wear?
Depending on your usage over time you will need to determine a regimen for checking your burr wear. Set up a monthly checklist so that you grind a set amount of coffee and use the kruve to sift the results to see if you have more or less fines and boulders in the kruve this month compared to last month. Over time, if the change is more than desired then it may be time to change your burr set in your coffee grinder.
How to use the Kruve Sifter to purchase a used or new grinder?
Perhaps, in this particular case we should only be looking for the tendency of the grinder in question. It may be the grinder produces more fines and boulders than another grinder. And, that is maybe all we can conclude.
There are many sieves for coffee but few match Kruve’s surface area, speed and efficiency with the likelihood of it not clogging, falling apart and making a mess of the counter and floor. We found the Kruve easier to handle than some other versions of coffee sifters with the gaskets attached to the screen and easily inserted into the metal holders - which was really pragmatic.
There are a couple limitations in that you can’t have more than 2 filter screens used at a time and the two metal filter holders are different sizes which means you need to make sure the larger filter screen you are using is in the upper metal filter holder.
You can read for yourself in depth what the Kruve was intended to be used for here.
How do you use the Kruve? Tell us in the comments section below.