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🔧 Owner's Guides · 2026Tablets, a brush and a purge — the routine, why dark roasts change it, and the one adjustment that jams burrs if you make it at the wrong moment.
Written and reviewed by the CoffeeLabAdvisor editorial team · Published 30 September 2026
Grind cleaning tablets through it, then purge with coffee. Empty the hopper, add the tablets — Urnex gives one jar cap for a home espresso grinder, two for a shop grinder — set a medium grind and run them through, then run coffee beans through afterwards to purge the residue. Baratza recommends this and says it is highly recommended if you grind mostly dark roast, because that is where the oil comes from. Wash the hopper and grounds bin in warm soapy water and dry them thoroughly. The tablets clean the burrs and casing without dismantling anything.
Two things, and they behave differently. Fines — the dust that every grind produces — pack into the corners of the burr chamber and the chute. Coffee oil coats everything it touches and then goes stale, which is the part you taste.
That is why roast level matters more than frequency of use. A grinder doing two doses a day of a light roast stays fairly clean; the same grinder on a dark, visibly oily roast needs the same attention in a fraction of the time. Baratza makes exactly this point: tablets are highly recommended if you are grinding primarily dark roast.
The symptom is rarely dramatic. Stale oil does not block anything, it just makes every cup taste slightly of the last month.
This is the routine that does most of the work, and it takes about five minutes:
The tablets are formulated to lift oil and particles from the burrs and the casing without taking the grinder apart, which is the entire appeal. Urnex describes them as made from natural, biodegradable ingredients.
Do not substitute rice, whatever the internet says. It is harder than the tablets are designed to be and several manufacturers void warranties over it.
Tablets clean the grind path. They do not clean the hopper walls, the lid, or the grounds bin, and those hold oil too. Baratza’s guidance is to wash the hopper and grounds bin in warm soapy water and dry them thoroughly — the drying matters, because any water going back into a burr chamber is worse than the oil you removed.
A stiff brush gets the chute and the area around the burrs between tablet cleans. If you are going further than that and actually removing burrs, follow your own manufacturer’s instructions rather than a general guide, because burr alignment and reassembly differ by machine and getting it wrong changes the grind.
Worth stating on a cleaning page because it is the most common self-inflicted grinder fault: on most grinders with a stepped or stepless collar, adjust the grind only while the burrs are turning.
De’Longhi says this explicitly for its built-in grinders — set the grinder only when the machine is actively grinding beans — and the same logic applies broadly. Turning an adjustment against stationary burrs with coffee between them is how they jam, and a jam is a dismantling job rather than a five-minute one.
If yours has already jammed and gone noisy, the usual cause is something in the beans that is not a bean. Power off at the wall first, then vacuum the hopper out so you can see in. Our De’Longhi problems guide works through that sequence.
There is no published universal interval, and anyone who gives you one is guessing at your beans. The honest version is that the schedule is set by what you grind:
The practical trigger is taste. When coffee you know well starts tasting flat or faintly rancid and the beans are fresh, clean the grinder before you blame the bag.
The two grinder-cleaning tablets we hold, and three reviewed grinders this routine applies to. Each product fact is the listing’s own statement.
Grinders need cleaning too, and nothing else does this job. Listing states professional coffee grinder cleaning tablets in a 430 gram container.
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Three pre-measured grinder cleans - the way to try grinder tablets before buying the jar. Listing states three single-use packets of a patented tablet that absorbs and loosens coffee grounds lodged in a grinder, cleaning without disassembling burrs or casings, and preventing flavour transfer between regular, decaf and flavoured beans.
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40 mm burrs · Conical Burr The best espresso grinder under $200: a repairable 40mm conical with 40 steps that pairs well with entry-level machines. Reliable and consistent, if not the clearest or most premium-feeling option.
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55 mm burrs · Flat Burr The value champion of flat-burr espresso grinding: 55mm hardened steel burrs, stepless adjustment and all-metal build at roughly $549. Superb clarity and consistency; timed dosing is the main workflow caveat.
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64 mm burrs · Flat Burr The flat-burr value king: 64mm burrs, stepless single-dose workflow and SSP upgrade potential at roughly $389. Exceptional price-to-performance; expect minor out-of-box tuning and a less premium finish.
Check price on Amazon →Grinder cleaning tablets. Empty the hopper, add the tablets — Urnex gives one jar cap for a home espresso grinder — set a medium grind, run them through, then purge with coffee beans. They lift oil and particles from the burrs and casing without dismantling anything.
Don’t. Rice is harder than purpose-made cleaning tablets are designed to be, and several grinder manufacturers treat it as grounds for voiding a warranty.
It depends on what you grind rather than how much. Baratza singles out dark roasts as the case where tablets are highly recommended, because that is where the oil comes from. Light roasts at low volume need it far less. Taste is the practical trigger.
Most grinders should be adjusted only while the burrs are turning. De’Longhi states this for its built-in grinders, and the logic holds generally — turning an adjustment against stationary burrs with coffee between them is how they jam.
Yes — Baratza’s guidance is warm soapy water for the hopper and grounds bin, dried thoroughly. The drying matters: water going back into a burr chamber is worse than the oil you just removed.
Sources for this page: Baratza, Grinder Cleaning Essentials, baratza.com/en-us/blog/cleaning/grinder-cleaning-essentials, read 2026-09-30 · Baratza, Urnex Coffee Grinder Cleaning Tablets product page, baratza.com, read 2026-09-30 · Urnex, Grindz Grinder Cleaning Tablets, urnex.com/grindz-grinder-cleaning-tablets, read 2026-09-30 · Baratza, Encore manual, baratza.com, read 2026-09-30 · De'Longhi US, Issues with the Coffee Grinder in My De'Longhi Coffee Machine FAQ, delonghi.com, read 2026-09-29 · Product facts: each item's own Amazon listing, read on the date shown on its card We have not lab-tested brewers; where a figure is a manufacturer's, the page names the manufacturer, and machine capabilities come from our own published review records.