Grindz Coffee Grinder Cleaning Tablets: Do They Actually Work?

Grindz is a cleaning product made by Urnex specifically for coffee grinders. The tablets look like small, compressed pellets that you run through your grinder just like coffee beans. They absorb old coffee oils, dislodge stale grounds from hard-to-reach places, and leave your burrs and grinding chamber cleaner than manual brushing alone. If you own a burr grinder and haven't been cleaning it regularly, Grindz is one of the easiest ways to get started.

I've been using Grindz tablets for about two years now on both my flat burr electric grinder and my hand grinder. Before discovering them, I was disassembling my grinder and hand-brushing every few weeks, which worked but was tedious. Grindz simplified the process significantly, though it doesn't replace deep cleaning entirely. Let me explain how they work, whether they're worth buying, and how to use them properly.

What Grindz Tablets Are Made Of

Grindz tablets are made from a food-safe mixture of grains, cereals, and natural binding agents compressed into pellet form. They're gluten-free and completely non-toxic. The formula is designed to be slightly abrasive (enough to scrub off coffee oil residue) without being hard enough to damage steel or ceramic burrs.

When the pellets pass through the burrs, they crumble into a flour-like powder that absorbs rancid coffee oils coating the burr surfaces and grinding chamber walls. The slight abrasion loosens stuck-on residue that a brush can't easily reach, particularly in the grooves of the burrs and in the chute between the burrs and the grounds bin.

The resulting powder that comes out the other side is typically a grayish or yellowish color, which is old coffee oils mixed with the tablet material. The darker the powder, the more buildup was in your grinder. If it comes out nearly white, your grinder was already pretty clean.

How to Use Grindz

The process is simple. Here's what I do every 3-4 weeks.

1. Empty the hopper. Remove any remaining whole beans from your grinder's bean hopper.
2. Add the tablets. Pour in about 35-40 grams of Grindz tablets (roughly one capful or a small handful). This is enough for most home grinders.
3. Set to medium grind. You want a middle setting so the tablets pass through at a moderate rate.
4. Run the grinder. Turn it on and let the tablets grind through completely. This takes about 20-30 seconds on an electric grinder. For a hand grinder, just crank until all the tablets have passed through.
5. Purge with beans. Grind 15-20 grams of regular coffee beans through the grinder to push out any remaining tablet residue. Discard these grounds. This is an important step. You don't want tablet dust flavoring your next cup.
6. Wipe down. Use a dry cloth or brush to clean out the grounds bin and any visible residue.

The whole process takes about 3-5 minutes, which is dramatically less effort than a full disassembly.

When to Use Grindz vs. Manual Cleaning

Grindz is great for routine maintenance, but it's not a substitute for a full deep clean. Here's how I think about it.

Use Grindz every 2-4 weeks as your regular cleaning cycle. This handles the everyday buildup of coffee oils on the burr surfaces and in the grinding path. It's fast, easy, and keeps your grinder performing well between deep cleans.

Do a full manual disassembly every 2-3 months. Take out the burrs, brush them with a stiff brush, vacuum or blow out the grinding chamber, and wipe everything down. This gets into corners and crevices that Grindz can't fully reach, like behind the inner burr where coffee fines accumulate.

Use Grindz whenever you switch bean types. If you're going from a dark, oily Brazilian roast to a light Ethiopian, the lingering oils from the previous beans will affect the taste of the new ones. Running Grindz between switches resets the grinder's flavor profile.

If you're looking for a grinder that's easy to clean and maintain, our best coffee grinder guide includes cleaning notes for each recommended model.

Do They Actually Improve Coffee Taste?

Yes, and the difference surprised me.

I ran an informal test where I brewed two cups of pour-over back to back. The first was from my grinder that hadn't been cleaned in about 6 weeks. The second was right after running Grindz through it. Same beans, same water, same recipe.

The first cup had a slightly stale, flat quality to it. Not terrible, but muted. The second cup was noticeably brighter, with more sweetness and more defined flavor notes. The difference was clearer than I expected.

What's happening is that rancid coffee oils on the burrs and in the grinding chamber contaminate every batch of coffee that passes through. You stop noticing because the degradation is gradual. But after cleaning, the improvement is obvious.

If you've ever wondered why your coffee doesn't taste as good as it did when your grinder was new, dirty burrs are probably the reason. Fresh beans, clean water, and clean equipment are the three legs of good coffee. Skip any one and the cup suffers.

Cost and Value

A standard container of Grindz (430g) costs about $15-18 and contains enough tablets for roughly 10-12 cleaning cycles. That works out to about $1.50 per cleaning session.

Is that worth it? I think so. The alternative is spending 20-30 minutes disassembling and hand-cleaning your grinder every few weeks. Grindz cuts that down to 3-5 minutes of mostly passive time (the grinder does the work). At $1.50 per session, I'm paying for convenience, and it delivers.

The only cheaper option is using dry rice as a grinder cleaner, which I don't recommend. Rice is harder than coffee and can chip ceramic burrs or stress electric grinder motors. Some manufacturers explicitly warn against it and will void your warranty if you use rice. Grindz is specifically formulated for grinder burrs and won't cause damage.

Grindz for Different Grinder Types

Grindz works with most burr grinders, but there are some differences to keep in mind.

Electric Flat Burr Grinders

These benefit the most from Grindz because flat burrs tend to retain more grounds in their wider, flatter grinding surfaces. Run the tablets on a medium setting and purge with beans afterward.

Electric Conical Burr Grinders

Same process as flat burr grinders. Conical burrs retain fewer grounds overall, so the cleaning might be slightly less dramatic, but it still makes a difference.

Hand Grinders

Grindz works fine in hand grinders. Pour the tablets into the hopper and crank normally. The only consideration is that hand grinders have smaller burrs, so use about 20-25 grams instead of the full 35-40 grams recommended for electric grinders.

Blade Grinders

Grindz doesn't work well in blade grinders. The tablets aren't designed for the chopping action of a blade. For blade grinders, the best cleaning method is grinding a piece of dry bread or wiping the blade and chamber with a dry cloth.

Super-Automatic Espresso Machines

Many super-automatic machines (Jura, DeLonghi, Saeco) have built-in cleaning cycles. Some of these accept Grindz tablets. Check your machine's manual before using them. Jura, for example, recommends their own branded tablets, but Grindz is generally compatible with most models.

For more information on keeping your grinder in top shape, check out our top coffee grinder roundup, which includes maintenance tips for each recommendation.

FAQ

Can Grindz damage my grinder burrs?

No. Grindz tablets are softer than both steel and ceramic burrs. They're designed to be abrasive enough to remove coffee oil residue but gentle enough to leave the burr surfaces untouched. I've used them regularly for two years with no signs of burr wear. The product is endorsed by major grinder manufacturers including Baratza and Rancilio.

How often should I use Grindz?

For home use, every 2-4 weeks is a good rhythm. If you grind dark, oily beans, lean toward every 2 weeks because they leave more residue. If you use light to medium roasts, monthly is usually sufficient. Commercial settings should use Grindz daily or at the end of each shift.

Do I need to adjust my grind setting back after using Grindz?

The tablets won't change your grind setting, but you should verify it after cleaning. Sometimes loosened residue can affect the burr alignment very slightly. Grind a few beans and check the particle size before brewing your next cup. In practice, I rarely need to adjust.

Are there alternatives to Grindz?

Full Wash by Cafetto is a similar product that works the same way. Some people use uncooked instant rice (not regular rice, which is too hard), though results vary and some manufacturers warn against it. Grindz is the most widely available and universally recommended option. It's the product Baratza themselves suggest for their grinders, which carries weight.

Keep Your Grinder Clean

If you take one thing from this article, make it this: clean your grinder regularly. A $300 grinder full of rancid oil and stale grounds makes worse coffee than a $50 grinder that's been freshly cleaned. Grindz tablets make the cleaning process so easy that there's really no excuse to skip it. Buy a jar, use it every few weeks, and your coffee will taste better for the effort.