Dr. Elsey's Ultra Clumping Clay cat litter bag

Bench tested

9.4Excellent

Best Clay LitterClumping Clay

Dr. Elsey's Ultra Review

Name: Dr. Elsey's Ultra Cat Litter
Brand: Dr. Elsey's
SKU: DR-ELSEYS-ULTRA-40
Price: 20.99 USD

Dr. Elsey's Ultra poured at 0.03mg per pour, the lowest clay dust reading we recorded, and its clumps scored 9.8/10. Skip it if you cannot lift a 40 lbs bag, or if you need a flushable litter.

Tested by Sage DeanHow we test

Last tested Mar 7, 2026Last updated Mar 7, 2026

Bench measures

Dust0.03mg

Clumps held98%

Cost a day$0.43

Measured (2026-03-07)

Cost per day$0.43$20.99 for 40 lbs, one cat

Type: Clumping Clay
Bag: 40 lbs
Price tier: $$

Check Best Price$20.99

Also at Chewy and Walmart

Dr. Elsey's Ultra is one of our recommended picks

After 90 days with the bag, Dr. Elsey's Ultra lives up to the hype. It measured 0.03mg per pour, the lowest clay reading in our set, and creates concrete-hard clumps that don't break. You pay more upfront, but you scoop less often and breathe easier.

Worth it if

You're sensitive to dust, hate broken clumps, have allergies or asthma, or want the lowest-maintenance option.

Skip it if

You're on a tight budget, can't lift heavy bags, or prioritize natural and flushable materials over performance.

What we liked

Measurably low dust (0.03mg per pour, the lowest clay figure we recorded)
Rock-solid clumps (98% survived our 3-foot drop test)
A bag ran 7 weeks with one cat, against 4.5 weeks for Super Scoop
Unscented and hypoallergenic (asthma-friendly)
Excellent for multi-cat households

What fell short

Premium price ($20.99 for 40 lbs)
Heavy bag, hard for some people to lift
Not flushable or eco-friendly (clay mining)
Moderate tracking (needs a good mat)

Dust

9.4Excellent

The best we have tested

This is where Dr. Elsey's shines. We poured from the bag and weighed what went into the air.

Dust Test Results (Particulate Matter)

Litter Brand	mg per Pour
Dr. Elsey's Ultra	0.03mg
Boxiecat Premium	0.04mg
World's Best	0.15mg
Arm & Hammer Clump & Seal	0.45mg
Arm & Hammer Super Scoop	0.52mg

Result: the lowest dust reading of any clumping litter we tested

Translation: you will not see dust clouds. We couldn't create one even when trying, which matters if you hate cleaning dust films off surfaces near the litter box. The EPA lists pet allergen proteins carried in dander, saliva and urine as an asthma trigger, and a low-dust bag is one less way for a litter box to carry them into the air.

Clumping

9.8Excellent

Rock-solid

We dropped clumps 3 feet onto a hard surface. 98% stayed completely intact.

Most budget litters crumble around the edges when scooped, leaving behind dirty litter that starts to smell after a week. Dr. Elsey's clumps are like concrete.

Why Hard Clumps Matter:

Scooping removes all the waste, with no crumbs left behind
One bag ran 7 weeks with a single cat, against 4.5 weeks for Super Scoop
No scraping wet cement off the box bottom
Fewer full box changes needed

Odor control

8.5Very good

Locks it away

Odor control is strong but works differently than scented litters. There is zero perfume. Instead, the hard clumps physically seal away moisture and bacteria.

In our multi-cat test, we noticed no smell for 3 weeks without a full box change. By week 4, a faint ammonia smell appeared, which is standard for unscented clay.

💡 Pro Tip: Stretch the Box Further

If you have multiple cats and want longer odor control, add an activated carbon additive. The carbon traps ammonia and odor compounds, keeping the box fresh longer without adding perfumes.

Odor Control Analysis

28-day ammonia monitoring test results

8.5

/10 Score

Ammonia Level Over Time

Fresh

0 ppm

Week 1

1 ppm

Week 2

4 ppm

Week 3

8 ppm

Week 4

18 ppm

Excellent (0-5 ppm)

Good (6-15 ppm)

Fair (16-25 ppm)

Poor (26+ ppm)

Reduction

not applicable

Fresh box read 0 ppm, so there is nothing to fall from

Odor Free

21 days

Before noticeable smell

Final Level

18 ppm

Fair at test end

Smell Rating

5/10

Human perception score

Key Findings

Hard clumping traps urine effectively
No perfumes means odor eventually becomes noticeable
Needs a full change at 3-4 weeks for multi-cat

Odor Control Strengths

No overpowering perfumes
Hard clumps remove all waste
Hypoallergenic

Odor Control Weaknesses

Can get smelly by week 4
Does not actively remove bacteria

Additive

Purrify - for when the litter is right and the room still smells

Activated carbon that goes into the litter you already use, so smell gets its own fix instead of a different bag. In our own use it made the biggest difference to litter-box smell of anything we have tried.

Read our Purrify guide to keeping the smell down with more than one cat.

Activated carbon, sold in bags
5.0 Google rating
Stocked in 40+ pet stores across Canada

See autoship options See Canadian trial Read our review

Tracking

7.2Fair

Better than light litters

This is the one average area. The granules are medium-sized and heavy, which helps keep them off paws, but they still track some.

Granules found inside the 12-inch perimeter zone without a mat: 18. With a honeycomb litter mat, tracking dropped sharply.

Value

8.8Very good

The real cost per day

Cost Breakdown (Single Cat):

Dr. Elsey's Ultra:

$20.99 per 40 lbs bag
Lasts 7 weeks
$0.43 per day

Arm & Hammer Super Scoop (budget clay):

$13.99 per 40 lbs bag
Lasts about 5 weeks
$0.35 per day

You pay pennies more per day for far less dust and much stronger clumping

In our opinion, that is the best few cents a day you can spend on your cat.

Reviewed by editorial team

ReviewCatLitter Team

Hands-on testing

No sponsored placements or free products

Last reviewed Mar 7, 2026

See the testing methodology

Raw test data

Every number we recorded for Dr. Elsey's Ultra. Anything we never measured says so.

Recorded test readings for Dr. Elsey's Ultra
Dust per pour	0.03 mg
Clump survival	98%
Clumps dropped	50 clumps
Ammonia at 24 hours	not measured
Ammonia at 48 hours	not measured
Ammonia at 72 hours	not measured
Tracking distance	not measured
Granules near the box	18 granules
Cost per day	$0.43
Bag price	$20.99
Cost per pound	$0.52
Tested through	Mar 7, 2026
Run length	90 days
Sample size	6 cats, 3 homes
Bought from	not recorded

Full ammonia run

Week 1: 1 ppm
Week 2: 4 ppm
Week 3: 8 ppm
Week 4: 18 ppm

See the same numbers for all products →We weighed the dust off 16 cat litters →

How We Tested Dr. Elsey's Ultra

90 days • 6 cats, 3 homes • tested Mar 7, 2026

How long

90 days

December 2025 to March 2026

Who used it

6 cats, 3 homes

Bench date

Mar 7, 2026

Bag bought from

not recorded

What we measured

Dust

0.03 mg

Airborne dust caught on a filter and weighed while the bag is poured. A particle counter reads a pour too, but counts are not weights.

Read with: not recorded

Clumping

98%

Share of clumps that stayed whole in the 3-foot drop test.

Samples: 50 clumps

Odor

1 ppm at week 1

Ammonia in the box, in parts per million, read as the run went on.

Week 1: 1 ppm
Week 2: 4 ppm
Week 3: 8 ppm
Week 4: 18 ppm

Read with: not recorded

Tracking

18 granules

Granules counted inside the 12-inch zone around the box.

Read with: not recorded

Every figure above is the reading we logged for this bag, shown next to every other litter we have tested on the test data page. Where a line says not measured or not recorded, we have not taken that reading yet and will not guess at it.

How we buy: We take no free product from manufacturers.

What Dr. Elsey's Ultra Actually Is

Dr. Elsey's Ultra is a medium-grain, hypoallergenic clumping clay litter. It's not fancy. No scent crystals, no color-changing beads, no robots attached. It's high-quality bentonite clay built to do one thing: clump fast and hard without creating a dust storm.

The company was founded by Dr. Bruce Elsey, a feline veterinarian with decades of experience. He created this litter to solve the leading reason cats are returned to shelters: peeing outside the box. The theory? Cats hate dust and smells just as much as you do.

🏆 Veterinary Endorsement

Dr. Elsey's is one of the few litters actually developed by a veterinarian. Dr. Bruce Elsey still practices and funds cat rescue organizations through the Dr. Elsey's Give Back Program.

Our Testing Process: The Actual Data

We didn't just scoop this once and write a review. We tested Dr. Elsey's Ultra for 90 days across 3 different scenarios with real equipment:

Single cat household: 1 box, cleaned twice daily
Multi-cat household: 2 cats, 2 boxes, cleaned once daily
High-traffic household: 3 cats, 3 boxes, cleaned twice daily

The standardized tests included:

→ Dust measurement: airborne particles weighed while pouring
→ Clumping strength: drop-testing clumps from 3 feet
→ Odor absorption: ammonia readings taken week by week
→ Tracking: granule count in the 12-inch perimeter zone

Who Should Buy Dr. Elsey's Ultra?

✅ Perfect For:

People with allergies or asthma
Those who hate dust clouds when pouring
Multi-cat households
Anyone tired of crumbly clumps
Homes where the litter box is in a living space

❌ Not For:

Tight budgets (budget clay costs less per day)
Those who can't lift a heavy bag
Eco-conscious buyers (clay mining)
Anyone needing flushable litter
People wanting scented options

Compare the Dr. Elsey's lineup

If you are trying to choose between Ultra, Cat Attract, Clean Tracks, and Touch of Outdoors, use our Dr. Elsey's litter differences guide. It explains which formula is built for behavior issues, lower tracking, or a scent-led setup.

Final Verdict

Dr. Elsey's Ultra isn't the cheapest litter on the shelf, and it's heavy to carry. But it performs where it counts: it stops dust, locks away pee in concrete-like clumps, and keeps your house smelling clean without fake perfumes.

It earned our Best Clay Litter pick because it solves the problems cat owners actually hate, dust and crumbling clumps, better than any other clay we tested.

Best Clay Litter

9.4/10 - the gold standard for dust-free clumping

Every score, spelled out

Dust control9.4/10

Clumping strength9.8/10

Odor control8.5/10

Tracking7.2/10

Value for money8.8/10

External resources

Official brand pages and third-party references used to cross-check claims:

What it really costs

One bag, one cat, one year

The sticker price is the least useful number on the bag. This is the same litter over a year, worked out from the price we last checked on Sep 2, 2026.

Dr. Elsey's Ultra, one cat, a year: $157
The middle litter on our bench, one cat, a year: $190

You keep

$33/yr

Against the middle litter on our bench, one cat, over a year.

How much does cat litter cost per month?

If this isn't it

The closest three on our bench

Better odor: 8.8

Dr. Elsey's Cat AttractScores 9.5 out of 10, $0.56 a day

Better tracking: 8.2

Boxiecat PremiumScores 9.2 out of 10, $0.55 a day

Better tracking: 9.1

PrettyLitterScores 8.8 out of 10, $0.80 a day

Ökocat is the only litter we weighed at zero dust, which is what matters after surgery or with a wheezy cat.

Winner: Dr. Elsey's Ultra

Questions people ask

Is Dr. Elsey's Ultra truly dust-free?

In our own dust test, Dr. Elsey's Ultra produced 0.03mg of particulates per pour, against 0.52mg for budget clay. It is not literally zero dust, but it's effectively invisible and won't create dust clouds during pouring or scooping. That makes it a good fit for people with asthma or allergies.

How long does Dr. Elsey's Ultra last?

For a single-cat household, a 40 lbs bag ran 7 weeks with daily scooping. Super Scoop, the budget clay in our set, ran 4.5 weeks. The hard clumping is the reason: waste comes out whole instead of crumbling. With two or three cats, expect 4.5 weeks per bag. You can stretch this further by adding an activated carbon deodorizer additive.

Is Dr. Elsey's Ultra good for multiple cats?

Yes, Dr. Elsey's Ultra is made for multi-cat households. The hard clumping keeps urine from reaching the bottom of the pan even with heavy use, and the unscented formula won't overwhelm sensitive cats. For best results with multiple cats, provide one litter box per cat plus one extra, and scoop at least once daily.

Can I flush Dr. Elsey's Ultra cat litter?

No, Dr. Elsey's Ultra should never be flushed. As a clay-based litter, it can cause serious plumbing blockages and damage septic systems. Even small amounts build up in pipes. Always put used litter in the trash. If you need a flushable option, consider World's Best Cat Litter (corn-based) instead.

Does Dr. Elsey's Ultra control odor well?

Dr. Elsey's Ultra controls odor through clumping rather than masking perfumes. The hard clumps seal away urine and feces, holding back ammonia. In our testing, a single-cat box stayed odor-free for 3 weeks without a full change. For stronger odor control in multi-cat households, pair it with an activated carbon deodorizer additive.

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