Grindz by Urnex: The Coffee Grinder Cleaning Tablets That Actually Work

Grindz by Urnex is a grinder cleaning product made from food-safe cereal-based pellets that remove coffee oil buildup, stale grounds, and residue from burr grinders. If you've ever wondered why your coffee tastes slightly off even with fresh beans, a dirty grinder is the most likely culprit. I started using Grindz about a year ago after noticing a rancid, bitter undertone in my espresso, and the difference after the first cleaning was immediately obvious.

Here's everything you need to know about Grindz: how it works, how to use it properly, whether it's safe for your grinder, and how it compares to other cleaning methods. I'll also cover how often you should be cleaning your grinder, because most home users don't do it nearly enough.

What Are Grindz Tablets?

Grindz are small, grain-based pellets (think of them as food-safe cereal pieces) designed to be run through your burr grinder just like coffee beans. As the burrs crush the pellets, they absorb and scrub away rancid coffee oils, fine particles, and built-up residue from the burr surfaces, the grinding chamber, and the exit chute.

The pellets are made from cereals and pharmaceutical-grade binders. They're completely food-safe and leave no harmful residue. After running Grindz through your grinder, you simply purge with a dose of cheap coffee beans to clear out any remaining pellet dust, and you're ready to grind as normal.

Urnex is a well-established cleaning products company that's been making commercial coffee equipment cleaners since 1936. They supply products to major chains and specialty shops alike. Grindz is their grinder-specific product, and it's widely used in both commercial and home settings.

How to Use Grindz Properly

The process is simple, but doing it right matters.

Step-by-Step Cleaning

Empty your hopper. Remove all coffee beans from the hopper. Run the grinder until no more coffee comes out.
Add Grindz pellets. Pour one capful (about 35-40 grams) of Grindz into the hopper. For smaller hand grinders, use about half that amount.
Grind at medium setting. Set your grinder to a medium grind setting. You don't want it too fine (the pellets are harder than coffee and create more resistance) or too coarse (they won't scrub effectively). Medium works best for most grinders.
Run the grinder. Turn it on and let the Grindz process through. You'll notice the output starts dark brown from old coffee residue and gradually lightens as the grinder gets cleaner. This takes about 20-30 seconds on most electric grinders.
Purge with coffee. Grind 20-30 grams of inexpensive coffee beans at your normal setting. This clears any remaining Grindz dust and re-seasons the burrs. Discard these grounds.
Resume normal grinding. Your grinder is clean and ready. The first shot or brew after cleaning will taste noticeably cleaner.

What You'll See

The first time you use Grindz on a grinder that hasn't been deep-cleaned in months, the output is genuinely alarming. Dark brown, oily, rancid-smelling powder comes out. That's the coffee oil that's been building up on your burrs and turning every cup slightly bitter. After seeing what comes out, you'll understand why regular cleaning matters.

How Often Should You Use Grindz?

This depends on how much you grind and what type of beans you use.

For daily home grinders (1-3 doses per day): Once a month is a good cadence. If you primarily drink oily dark roasts, bump that to every two weeks. Dark roasts deposit significantly more oil on burr surfaces than lighter roasts.

For light roast drinkers: Every 4-6 weeks is usually sufficient. Light roasts produce less residue, but oils still accumulate over time.

For commercial settings: Weekly or even daily, depending on volume. High-volume grinders processing 10 or more pounds per day should use Grindz at least once a week.

Signs your grinder needs cleaning now: - Bitter, rancid, or "off" taste in your coffee that isn't related to the beans - Increased static and clumping in your grounds - Grinder running slower than usual - Grounds look oilier or clumpier than normal - Visible brown residue when you look inside the burr chamber

Is Grindz Safe for All Grinders?

Grindz is designed for burr grinders, both flat and conical, both electric and manual. Urnex explicitly states compatibility with all major brands including Baratza, Eureka, Mazzer, Mahlkonig, Fellow, Breville, and hand grinders from 1Zpresso, Comandante, and others.

A Few Cautions

Blade grinders. Grindz is technically safe for blade grinders, but it's overkill. Blade grinders don't build up residue the same way burrs do. A simple wipe with a damp cloth is usually sufficient.

Very fine espresso settings. Don't run Grindz at your finest espresso setting. The pellets are harder and denser than coffee beans and can put excessive stress on the motor if the burrs are set too close. Medium is the safe zone.

Ultra-premium hand grinders. Grindz works in hand grinders, but some owners of high-end titanium-coated or ceramic burr grinders prefer dry brushing only. Check your grinder's manual or the manufacturer's recommendations.

Don't use Grindz with water. This sounds obvious, but it's worth saying. Grindz is a dry cleaning product. Never add water or liquid to the grinder during the Grindz cycle.

Grindz vs. Other Cleaning Methods

There are several ways to clean a burr grinder. Here's how Grindz compares.

Grindz vs. Dry Brushing

Dry brushing with a grinder brush removes loose grounds and surface debris, but it doesn't address oil buildup. Think of it like dry-wiping a greasy pan versus actually using soap. Both have their place, but brushing alone won't remove the rancid oil layer that affects flavor.

My recommendation: brush your grinder after every use (or every few uses), and use Grindz monthly for the deep clean. They complement each other.

Grindz vs. Rice

You'll find advice online about grinding dry rice through your grinder to clean it. I don't recommend this. Rice is much harder than coffee or Grindz pellets and can chip or crack burrs over time. It also doesn't absorb oils the way Grindz does. Rice is also starchy, and that starch can coat the burrs and attract more residue. Most grinder manufacturers explicitly warn against using rice.

Grindz vs. Full Disassembly

Taking your burrs apart and scrubbing them by hand is the most thorough cleaning method. But it's also the most time-consuming, and most people won't do it often enough. I disassemble and hand-clean my burrs every 3-4 months, with Grindz treatments in between. This combination keeps the grinder performing at its best without requiring a 30-minute cleaning session every month.

For ideas on grinders that are easy to maintain and clean, check out our best coffee grinder roundup.

Cost and Value

A single jar of Grindz contains about 430 grams, which provides roughly 12 cleaning sessions at the recommended dose. Prices typically run $15-20 per jar.

That works out to about $1.25-1.60 per cleaning. For a product that extends burr life, improves coffee flavor, and takes 60 seconds to use, I consider that good value. A single bag of wasted specialty coffee beans due to a dirty grinder costs more than a month's worth of Grindz.

You can also buy Grindz in single-use packets, which are convenient if you want to try the product before committing to a full jar.

Frequently Asked Questions

Will Grindz affect the taste of my next coffee?

If you purge with 20-30 grams of coffee after using Grindz, no. The purge clears any remaining pellet dust. I've never noticed any off-flavors after following the proper cleaning procedure.

Can I use Grindz in my Baratza Encore?

Yes. Baratza actually recommends Grindz (they sell it on their own website). The Encore, Virtuoso, Sette, and Vario are all compatible.

How do I know Grindz actually cleaned my grinder?

Look at the output. If it comes out dark brown and smells stale, the Grindz absorbed and removed old residue. You can also inspect the burrs before and after. A clean burr has a metallic sheen. A dirty burr looks brown and matte from oil coating.

Is Grindz better than Cafiza for grinder cleaning?

These are different products for different purposes. Cafiza is Urnex's espresso machine cleaner designed for group heads and portafilters. Grindz is specifically formulated for grinders. Don't use Cafiza in your grinder, and don't use Grindz in your espresso machine.

Our top coffee grinder guide includes maintenance tips alongside grinder reviews if you want more context on keeping your equipment in top shape.

The Practical Bottom Line

Grindz by Urnex is the easiest and most effective way to keep your burr grinder clean between full disassembly sessions. It takes 60 seconds, costs about a dollar per use, and the improvement in cup quality is noticeable. If you can't remember the last time you deep-cleaned your grinder, buy a jar of Grindz and run it today. Your next cup of coffee will taste better, and you'll wonder why you waited so long.