Best Clay Clumping Litter: A Bentonite Clay Bag Among the Clay Options

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Clay clumping litter is litter whose clumps form when liquid meets clay, and the best one for most buyers is the one whose scent, bag size and disposal rules fit the home. This post compares the clay options in one research file and reads one of them closely: Dr. Elsey’s Ultra Unscented Clumping Clay Cat Litter, a 40 lb bag that the listing describes as 100 percent bentonite clay. The four clay listings in the file differ mainly in scent and bag size. The two tofu listings differ in material, so the comparison below is about what each listing states, not about which clay performs better.

Quick answer

• Among the four clay listings in the file, the Dr. Elsey’s bag is the only unscented one. Its listing describes the litter as 100 percent bentonite clay.
• Bag sizes differ across the clay listings: 40 lb for Dr. Elsey’s, 38 lb for Purina, 18 lb for ARM & HAMMER and 14 lb for Fresh Step. The arithmetic below works from those figures.
• Clay and tofu are different materials. The tofu listings say their litter breaks down in water and can be flushed, and the Dr. Elsey’s directions say do not flush.
• No clay listing in the file gives a clump strength figure, and none explains how its dust figure was obtained.

The clay listings side by side

The table sets out the four clay listings, with the material, scent, bag size and flush rule each listing states.

Listing in the research file	Material	Scent	Listed bag size	Flushable, per its bullets
Dr. Elsey’s Ultra (this post)	Clay litter, 100% bentonite	Unscented	40 lb (18.14 kg)	No; directions say do not flush
ARM & HAMMER Slide Platinum	Clay	Fresh scent	18 lb	Not stated
Fresh Step Extreme Mountain Spring	Clay	Mountain Spring	14 lb	Not stated
Purina Tidy Cats Glade Clear Springs	Clay	Glade Clear Springs	38 lb	Not stated

The four rows show one clear split, and it is scent. Three clay bags carry a fragrance in the title or the scent field. The Dr. Elsey’s bag is the one whose title and scent field both say unscented, so it is the clay option for a buyer who wants no added smell.

The bag arithmetic

The weights below are the figures the listings give. Each formula is written out so the comparison can be checked.

Comparison	Formula	Result
Dr. Elsey’s against ARM & HAMMER, by weight	40 / 18 = 2.22	The Dr. Elsey’s bag weighs 2.22 times as much
Dr. Elsey’s against Fresh Step, by weight	40 / 14 = 2.86	The Dr. Elsey’s bag weighs 2.86 times as much
Dr. Elsey’s against Purina, by weight	40 / 38 = 1.05	The Dr. Elsey’s bag weighs 1.05 times as much
Dr. Elsey’s bag in kilograms	40 x 0.4536 = 18.14	18.14 kg
Purina bag in kilograms	38 x 0.4536 = 17.24	17.24 kg

Weight answers one question, which is how much litter comes in the bag. It does not tell you how many fills a bag gives, because three of the four clay listings state no volume. The one volume in the group is the Fresh Step capacity of 0.25 cubic feet. Our calculation from that listing alone is 14 / 0.25 = 56 pounds per cubic foot. That is a figure for one bag, and it is not a basis for ranking the other three, since their listings give no volume.

The tofu listings: a different material

The two tofu listings in the file are different litters with different routines. The Tuft & Paw bullets describe a soybean tofu litter that clumps quickly, breaks down in water, and is 100 percent flushable. The PETKIT bullets describe a blend of tofu and bentonite that is water dissolvable and flushable, and they warn against pouring in too much at once. Neither is a clay litter, and the Dr. Elsey’s directions say not to flush.

The two tofu bags also differ in how their weights are stated. The Tuft & Paw title gives 9.25 lb for each of two bags, and 9.25 x 2 = 18.5 pounds. Its item weight field reads 19 pounds. The gap is 19 – 18.5 = 0.5 pound, and the listing does not explain it. The PETKIT title gives 7.9 lb for each of four bags, and 7.9 x 4 = 31.6 pounds, which matches its own weight field of 31.6 pounds.

What the clay bullets claim

The clay listings describe clumps in four different ways. The ARM & HAMMER bullets describe rock-hard, scoopable clumps that slide out of the box. The Fresh Step bullets describe tight clumps that lock in liquid and odor. The Purina bullets describe strong, tight clumps for easy scooping. The Dr. Elsey’s bullets describe hard clumps that do not break down. Each is the maker’s description of the clump, and none gives a number for how firm the clump is.

The odor claims are stated as periods, and the periods differ. The Fresh Step bullets say 15 days of odor control, and the Purina bullets say 10-day odor control when used as directed. The gap between them is 15 – 10 = 5 days. The ARM & HAMMER bullets describe 24/7 odor fighting and a triple-action formula, with no period. The Dr. Elsey’s bullets describe superior odor control, with no period and no comparison. The listings do not say how each period was set, so the gap is the makers’ claim, not a result anyone can check from the page.

Scent: what the fragranced options carry

ARM & HAMMER describes a fresh scent, and its scent field reads Fresh Scent. Fresh Step describes a Mountain Spring scent with a Febreze freshness claim, and its scent field reads Mountain Spring. Purina describes a Glade Clear Springs scent that leaves a light floral fragrance. A buyer who wants no fragrance has one clay option in this file, and it is the Dr. Elsey’s bag. For odor-control box choices, see Best Cat Litter Box for Odor Control.

What the listings do not say about clay

The listings describe clay and its clumps, but none of them explains how the material behaves in a litter box over a period of use. The only sources this post opened are the product page for the Dr. Elsey’s bag and the research file’s copies of the other listings. A general claim about how clay works would go beyond both, so this post makes none.

Who clay clumping litter suits

• A buyer who scoops by hand and disposes of used litter in the trash, which is the routine the Dr. Elsey’s directions set out.
• A buyer who wants an unscented clay, and in this file that means the Dr. Elsey’s bag only.
• A household with several cats that wants a large bag. At 40 lb, it is the largest of the four clay bags, although weight is not the same as volume. For multi-cat boxes, see Best Cat Box for Multiple Cats.

Clay litter does not suit a flushable routine. The tofu listings are the ones that describe flushing, and that is a different product type with its own disposal rule. For a paper-based alternative, see Recycled Paper Cat Litter.

The product we chose

This post covers one product, so one card follows. The card uses the listing’s own title and bullets.

How we chose

The research file for “clay clumping litter” was read on 22 October 2026, and its data was checked on 20 October 2026. It holds six products from six brands. Four are clay litters and two are tofu litters. The file does not rank them, and this post does not rank them either.

We applied three checks in order. First, the material must be clay, because the keyword names clay. Second, the listing must give a bag size. Third, the listing should state its scent, because the four clay listings differ on scent. The Dr. Elsey’s listing passes all three, and it is the only clay listing in the file with no fragrance.

The other five products were not chosen for these reasons:

• ARM & HAMMER Slide Platinum: a clay litter in an 18 lb bag with a fresh scent. It is scented, which does not match the unscented choice here.
• Fresh Step Extreme Mountain Spring: a clay litter in a 14 lb box with a Mountain Spring scent. It is scented.
• Purina Tidy Cats Glade Clear Springs: a clay litter in a 38 lb box with a Glade Clear Springs fragrance. It is scented.
• Tuft & Paw OdorStop: a soybean tofu litter that its bullets describe as flushable. It is not a clay litter.
• PETKIT mixed litter: a blend of tofu and bentonite that its bullets describe as flushable. It is a mixed litter, not a single clay.

What we could not verify

• Clump strength over time, for any clay bag. None is stated.
• The dust figures. Dr. Elsey’s gives 99.9 percent in one place and 99 percent in another. The other clay listings describe low dust without a figure. None explains a method.
• The odor periods. The 15-day and 10-day claims have no stated basis.
• The ARM & HAMMER claim of 10 percent more odor eliminators in its online Platinum formula. The listing states it, and this post cannot confirm it.
• The Tuft & Paw weight gap, 18.5 pounds from the title against 19 pounds in the weight field. The listing does not explain it.
• The PETKIT blend percentages, 67.66 percent tofu and 29 percent bentonite among them. They are the maker’s figures.
• Use in robotic boxes. The ARM & HAMMER listing says its litter works in both traditional and robotic boxes, and this post cannot confirm that.
• Volume for three of the four clay bags. Only the Fresh Step listing gives one.

Buying checklist

1. Decide clay or tofu first, since the two are different materials with different disposal rules in their listings.
2. Choose the scent. In this file, the Dr. Elsey’s bag is the only clay option without a fragrance.
3. Compare bag weights, and remember that weight is not volume for three of the four clay bags.
4. Check the disposal rule before you buy. The Dr. Elsey’s directions say trash.
5. Read the odor periods as the makers’ claims, since none explains its basis.
6. Plan for the lift. At 40 lb, the Dr. Elsey’s bag is the heaviest of the four clay bags. For the full setup, see Kitty Litter System.
7. For a cleaner routine around the box, see Best Way to Clean Litter Box.

Mistakes to avoid

• Comparing bag weights as if they were fill volumes. Only the Fresh Step listing gives a volume.
• Flushing a clay litter because a tofu listing says its litter can be flushed. The Dr. Elsey’s directions say do not flush.
• Treating the 15-day and 10-day odor claims as the same kind of evidence. Each is a maker’s period with no stated basis, so the 5-day gap is not a result.
• Taking the 19 pound Tuft & Paw figure at face value, since its own title gives 18.5 pounds.
• Expecting a clump strength figure. No listing in the file gives one.

FAQ

What makes clay clumping litter clump?

The listings say the clay forms firm clumps, and the Dr. Elsey’s listing names 100 percent bentonite clay as the material. The listings describe the result, not the mechanism in detail, so this post adds nothing beyond them.

Is clay litter flushable?

Not the Dr. Elsey’s bag. Its directions say to dispose of used litter in the trash and say do not flush. The tofu listings in the file describe flushing, and they are a different product type.

Which clay litter is unscented?

Among the four clay listings in the file, only the Dr. Elsey’s bag is unscented. The other three list a fragrance.

How heavy is the 40 lb bag?

It weighs 40 pounds, or 18.14 kilograms by the listing’s own figures. It is the heaviest of the four clay bags in the file.

Do tofu litters clump like clay?

The tofu listings describe quick clumping that breaks down in water, which is a different routine from the hard clumps the clay listings describe. The listings do not compare the two directly.

Does any clay listing give a clump strength figure?

No. The listings use words such as hard, rock-hard and tight, but none gives a number for clump strength.

Bottom line

If you want a clay clumping litter with no fragrance and trash disposal, the Dr. Elsey’s bag is the one this file offers. Compare the bag weights with care, because three of the four clay listings give no volume. If you want a flushable routine, the tofu listings are a different product and need their own check. For more on litter types and routines, see Types of Cat Litter, Scoopable Cat Litter and Litter Box Placement.

Sources

• https://www.amazon.com/dp/B0009X29WK