Grindz Burr Grinder Cleaner: Does It Actually Work?

I ignored grinder cleaning for an embarrassingly long time. About eight months into owning my Baratza Encore, my coffee started tasting flat and slightly rancid no matter what beans I used. A quick Google search led me to Grindz, and within 15 minutes, my grinder was producing coffee that tasted right again. That single experience turned me into someone who cleans his grinder on a strict schedule.

Grindz is a grinder cleaning tablet made by Urnex, the same company that makes Cafiza espresso machine cleaner. The tablets are designed to be run through your burr grinder like regular coffee beans. They absorb old coffee oils, dislodge stale grounds, and leave the burr chamber clean without requiring you to disassemble anything. A 430-gram jar costs about $18 to $22 and lasts most home users 6 to 12 months.

How Grindz Works

The tablets look like small, off-white pellets, roughly the size and shape of coffee beans. They are made from a food-safe mixture of grains and binding agents designed to be slightly softer than coffee beans.

Here is the basic process:

  1. Empty your hopper of all coffee beans
  2. Add about one capful (35 to 40 grams) of Grindz tablets to the hopper
  3. Run the grinder at a medium setting until all the tablets have passed through
  4. Add a small amount of regular coffee beans (about 20 grams) and grind them to purge any remaining Grindz residue
  5. Discard both the Grindz output and the purge grounds

The whole process takes about 3 to 5 minutes. No tools, no disassembly, no compressed air.

What Happens Inside the Grinder

As the tablets grind, they break apart and absorb the rancid coffee oils that coat the burrs, the grinding chamber, and the chute. Coffee oils are the main culprit behind stale, off-tasting coffee from a dirty grinder. Over weeks and months, those oils oxidize and go rancid. Even a tiny amount of old oil can taint an otherwise fresh batch of grounds.

The Grindz tablets also push out retained grounds that are stuck in crevices and along the chute walls. When I run Grindz through my grinder, the output is always a mix of the broken-down tablet material and dark, compressed old grounds that I had no idea were hiding in there.

How Often Should You Clean?

Urnex recommends cleaning every one to two weeks for daily use. That is reasonable for most home grinders.

Here is my actual schedule based on how much I grind:

  • Daily grinder (2 to 4 doses per day): Grindz every 2 weeks
  • Occasional grinder (a few times per week): Grindz once a month
  • After switching bean types: I always run Grindz when switching from dark roast to light roast. Dark roast beans leave significantly more oil on the burrs, and that oil will affect the flavor of lighter beans.

If you notice any of these signs, your grinder needs cleaning now:

  • Coffee tastes flat, stale, or slightly rancid
  • The grinder is slower than usual
  • Grounds are clumping more than normal
  • You can see visible oil buildup on the burrs (shine a flashlight in there)

Grindz vs. Other Cleaning Methods

Grindz vs. Rice

You will hear people recommend running dry rice through your grinder as a cheap alternative. I tried this once, and I would not do it again.

Rice is significantly harder than coffee beans. It puts extra stress on the burrs and the motor, especially on home grinders that are not built for that kind of abuse. Baratza explicitly warns against using rice in their grinders because it can crack ceramic burrs and strain the motor.

Grindz tablets are specifically formulated to be softer than coffee beans. They clean without adding mechanical stress.

Grindz vs. Manual Cleaning

Taking your grinder apart and brushing the burrs by hand is the most thorough cleaning method. For a deep clean every 3 to 6 months, I still recommend doing this. But manual cleaning takes 15 to 30 minutes, requires some mechanical comfort, and risks losing small parts or reassembling incorrectly.

Grindz fills the gap between deep cleans. Think of it as your regular maintenance, with manual disassembly being the occasional deep dive.

Grindz vs. Full Wash Cleaner

Urnex also makes a liquid grinder cleaner called Full Wash that is designed for commercial grinders. It requires disassembly and soaking. For home use, Grindz is simpler and sufficient. Full Wash is overkill unless you are running a cafe grinder that sees hundreds of doses daily.

If you are looking for a grinder that is easy to maintain, our best burr coffee grinder guide factors in cleaning accessibility.

Which Grinders Work with Grindz?

Grindz is compatible with virtually all electric burr grinders, both flat and conical.

Works well with: - Baratza Encore, Virtuoso, Sette, Vario - Breville Smart Grinder Pro - Eureka Mignon series - Fellow Ode and Opus - Rancilio Rocky - Most commercial grinders (Mazzer, Mahlkonig, etc.)

Use with caution: - Hand grinders. Grindz can work in hand grinders, but the tablets are harder to crank through manually. I have done it with my Comandante, and it works, but it takes effort. For hand grinders, a brush and compressed air is usually easier. - Very small grinders. If your grinder has tiny burrs (under 38mm), the tablets may not feed smoothly. Break them in half before adding them to the hopper.

Do not use with: - Blade grinders. There are no burrs to clean, and the tablets will not break down properly in a blade grinder.

Getting the Most Out of Grindz

A few tips I have picked up after using Grindz for years:

Always purge with real beans after. The Grindz residue is food-safe but tastes terrible. Run 15 to 20 grams of cheap coffee through the grinder after cleaning and discard the output. Your next real grind will be clean.

Use a medium grind setting. This gives the tablets enough time to break down and absorb oils without going through too quickly (coarse) or jamming (fine). I use my pour-over setting for cleaning, regardless of what I normally brew.

Store the jar tightly sealed. Grindz tablets absorb moisture from the air, which makes them crumbly and less effective. Keep the lid on tight between uses.

Check the chute after cleaning. Sometimes a bit of compressed Grindz residue sticks in the exit chute. A quick tap or a poke with the cleaning brush clears it out.

For more on maintaining your grinder and getting the best performance, our best burr grinder roundup includes cleaning tips for each model.

Frequently Asked Questions

Is Grindz food-safe?

Yes. Grindz is made from food-grade grains and binding agents. It is certified by NSF International and is safe for use in any food-contact grinder. You should still purge with real coffee after cleaning, but accidental contact is not a health concern.

How much Grindz do I use per cleaning?

About one capful, which is roughly 35 to 40 grams. The jar includes a measuring cap. Using more does not improve cleaning. Using less may not clean thoroughly.

Can Grindz damage my burrs?

No. The tablets are softer than coffee beans and will not accelerate burr wear. This is the main advantage over rice, which is harder than most burrs and can cause damage over time.

Is there a cheaper alternative to Grindz?

You could buy plain white rice, but as I mentioned, rice risks damaging your grinder and several manufacturers warn against it. Some people use stale bread crusts, which are softer, but they do not absorb oils the way Grindz does. At $18 to $22 per jar lasting 6 to 12 months, Grindz costs about $2 per month. That is a small price for keeping your coffee tasting fresh.

Worth Every Penny

Grindz is one of those products that does exactly what it claims with zero fuss. You pour it in, grind, purge, and your grinder tastes like new. It takes 5 minutes, costs almost nothing per use, and prevents the slow flavor degradation that sneaks up on you when coffee oils go rancid inside your grinder. If you own a burr grinder and you are not cleaning it regularly, a jar of Grindz is the fastest improvement you can make to your daily cup.