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Can Rock Tumbler Grit Be Reused? You Should Know This

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Calling all rock tumblers! Do you feel like you are throwing away perfectly good grit? The price of everything is rising, and tumbling grit is no exception. In an attempt to save money, you may be wondering how to go about doing that. Is reusing tumbler grit the answer?

Rock tumbling for some is a hobby or passion. And, for others, it is a career. Either way, materials can be costly. To save money, some people will reuse their Silicon Carbide grit. While this may seem like a good idea, it ends up costing more and being less effective. Plastic filler pellets can be reused, though.

Let’s get down to the nitty-gritty of rock tumbling. Should we, or shouldn’t we reuse our tumbling grit? That is the question.

If you are interested in checking out the best grits for rock tumbling you can find them by clicking here (Amazon link).

Rock Tumbling Grit

Can Rock Tumbler Grit Be Reused
Can Rock Tumbler Grit Be Reused?

What people love about rock tumbling is taking something as simple as a rock, and turning it into a shiny piece of art. The great thing about rock tumblers is that they do most of the work for you. The finished product makes great jewelry or display pieces.

Just toss in your rocks, and a few scoops of grit, add some water, and hit the power switch. The rocks are typically purchased as raw or rough stones.

To get them polished and looking pretty, it is going to take some serious scrubbing. That’s where grit and the constant motion come into play.

Grit is a man-made material called Silicon Carbide. This media has been used as an abrasive since 1893. Used for things like sandblasting, waterjet cutting, and rock tumbling.

Once the grit has been tumbled around with your batch of rocks for a cycle, it is filled with particles of rock, dirt, and other foreign materials.

Most experienced tumblers would agree that while they would love to reuse the tumbling grit, they won’t do it. It is not worth it to risk it. Reusing grit will not harm your tumbler.

However, it can damage the next batch of rock. Plus, it just isn’t the same consistency as when it is first mixed with water.

Reusing Rock Tumbler Grit

Does it hurt anything if you reuse tumbling grit? It could damage your rocks due to small particles of precious rocks that were left behind. When you reuse rock tumbling grit this is what happens.

While you may be trying to save money or save the planet by reusing grit, what is actually happening is that your tumbler has to work twice as long when it is filled with recycled grit.

So, if we stop to put it into perspective, that is more money spent on electricity. And, also more wear on your machine.

Reusing grit is not a common practice in the rock tumbling community. However, it does happen. So, you may come across experienced tumblers that have been reusing grit for years.

They rinse the slurry off, let the water either evaporate or dump it off. Then, reuse the grit the next time they tumble.

One thing that can be reused is the plastic pellets that are used for filler if you do not have enough rocks to make a full barrel.

Though you can reuse the pellets, they should be used with the same size grit every time to prevent cross-contamination. Rinse them well to prevent grit from hardening onto them. Air-dry the pellets and label them before you pack them away.

Rock Tumbler Grit Substitutes

Looking for a less expensive rock tumbler grit? Or, perhaps a substitute material that is more budget-friendly?

While the thought may have crossed your mind to grab a pound of sand from the sandbox in your backyard to try in your tumbler, you can forget that idea.

The granules all need to be the same size, shape, and type. And, to compare every grain of sand in a one-pound bag is next to impossible.

The only thing that is recommended to use in your tumbler is water and Silicon Carbide grit that is specially designed for tumbling rocks. Not beach sand, nor salt, or kitty litter.

Silicon Carbide is special because the particles are hard enough that they won’t get rounded during tumbling. This may be one reason that people believe grit to be reusable.

Your best bet is to buy in bulk and to shop around. Just because you have found a brand that you like doesn’t mean that you are currently getting the best price that is out there.

Another trick of the trade is to buy a less expensive grit for the first step, and a more premium brand for the polish stages.

TIP: Have you ever think about using sand for tumbling? Well, it is not the best idea but sand can be great as a pre-grit. Read more about this option:


Can You Tumble Rocks with Sand? Everything You Need to Know


Proper Grit Disposal

Do not rinse grit down the drain. As wet grit dries out, it hardens quickly and turns into a cement-like substance. Dried grit will ruin your plumbing, and your day.

The most popular way to dispose of used water, slurry, and grit particles is actually to throw it out the door. Dumping residues in your driveway, garden, or woods behind your house.

Remember this is a man-made substance. And, while many people dump their grit in the driveway or garden, the Silicon Carbide can get eaten by animals or soak into the ground.

Rotary Tumbler vs Vibratory Tumbler

The two main types of rock tumblers are rotary & vibratory. Just by the names, you can probably guess the main difference between the machines.

Can you reuse grit in either of these tumblers?

It is not recommended to reuse grit in either style of the tumbler. However, the vibratory tumbler does use less grit than a rotary tumbler. So, using a vibratory style would cut down on how much grit you buy.

  • Rotary – The more popular/common of the two main types of tumblers. The rotary tumbler uses about 2 TBSP of grit per pound of rock. The tumbling cycle is typically 7-10 days. Rounds the rocks out.
  • Vibratory – The vibratory tumbler uses about half the amount of grit, and works in less than half the time of a rotary tumbler. Produces high shine, rock does not become rounded but keeps the original shape.

TIP: Do you know you can also tumble your rocks without a tumbler? Yes, you can tumble rocks with your hands. Read more about how to tumble rocks without a tumbler here:


Can You Tumble Rocks Without a Tumbler? Step-by-Step Guide


Top Tips for Using Tumbler Grit

In addition to using fresh grit every tumble, here are a few more tips on how to get the most tumble for your time, effort, and money.

  • You need to keep it separated

For those that use a rotary tumbler, try using separate barrels for the polishing stages. Or, a different barrel for each stage, and each level of grit. This goes for vibratory tumblers, as well.

Using separate barrels eliminates the need to deep clean a single barrel between steps. If you do not clean between steps your rougher grit can carry through to the following stages possibly creating scratches.

  • A variety of sizes

It is recommended to tumble the same type of rocks together. Instead of type, you can tumble rocks together that are similar in hardness. Tumbling stones together that are a variety of sizes will give you more friction (in a good way.)

  • Use your water pick

Cleaning rocks between steps is one of the most important parts of rock tumbling.  A water pick works wonderfully for getting into any areas that grit may be stuck.

  • Use two tumblers

For those that enjoy the roundedness that you get from a rotary tumbler, but with the process was shorter, here’s your solution. Complete step one using a rotary tumbler to get the rounded effect. Then use a vibratory tumbler to speed up the rest of the steps.

  • You can tumble more than once

Re-tumble rocks as many times as you like. The more you tumble them, the smoother, less pitted, and higher shine they will have.

For a deeper dive into the educational side of rocks, check out this experiment you can try.

The Key Takeaway

Unfortunately, we are really not able to reuse our tumbling grit. However, there are plenty of tips above to help you get more out of rock tumbling. Try out some of these tips to see how they work for you. Happy tumbling!

TIP: When you want to tumble rocks, you need to find some first. Check out where are the best places for finding rocks in the US:


Where to Find Rocks, Minerals & Crystals in the USA