For most multi-cat households, Sustainably Yours corn-cassava litter wins overall: it clumps nearly as hard as clay at roughly half the bag weight, with very little airborne dust. Choose Naturally Fresh walnut for the strongest odour masking, and Arm & Hammer clay when maximum clump rigidity matters most. Shop cat litter in North York to compare all three.
Litter is the one cat product you buy again and again, forever. Get it wrong and you're scooping crumbling clumps, sweeping granules off the hallway floor, and — worst case — watching your cat use the bath mat instead. We stock all three of these lines, and the questions we get in the aisle are always the same three: does it clump, does it stink, and how fast do I go through a bag? Below is what we've seen from customers and from the bags themselves. If you're also rethinking diet, our wet cat food selection matters more to litter box performance than most owners expect.
Which litter clumps hardest: walnut, corn-cassava, or clay?
Arm & Hammer clay produces the most rigid clumps because sodium bentonite swells and locks into a solid mass within 2 to 5 minutes. Sustainably Yours is a close second thanks to cassava starch acting as a natural binder. Naturally Fresh walnut clumps well but tends to form softer, slightly crumblier masses, especially on the bottom of a shallow box.
Clump integrity comes down to two things: how quickly the material absorbs liquid, and whether it forms a shell that survives being lifted on a slotted scoop. Bentonite clay is the benchmark — it can absorb several times its own weight and holds shape indefinitely, which is why Arm & Hammer Clump & Seal remains the choice for owners who want to scoop once a day with zero breakage.
Sustainably Yours blends corn with cassava, and that starch content is the reason it behaves so much like clay. In our store we see customers switching from clay to this one specifically because they want a plant-based litter that doesn't fall apart. Naturally Fresh uses ground walnut shells (Eco-Shell), a fibrous material that absorbs by wicking rather than swelling. It holds together if you maintain 3 to 4 inches of depth — go thinner than 3 inches and clumps will stick to the box floor.
Does litter depth change clumping performance?
Yes, significantly. All three brands clump best at 3 to 4 inches of depth. Below 2.5 inches, urine reaches the box floor before the granules finish binding, producing stuck patches you have to chip out. Top up about 1 inch of fresh litter weekly to replace what you scoop away.
Dust levels and the low-dust question for asthmatic cats
Naturally Fresh walnut and Sustainably Yours corn-cassava both produce noticeably less airborne dust than traditional clay, because neither relies on finely milled mineral particles. Arm & Hammer's dust-reduction formulas cut clay dust substantially compared with basic clay litters, but a plant-based litter is still the lower-dust category overall.
This matters for cats with feline asthma and for owners with respiratory sensitivities. The American Veterinary Medical Association and feline respiratory studies indexed on NCBI/PubMed both point to airborne particulate and strong fragrance as common environmental triggers for coughing cats. Reducing dust is supportive management, not treatment — if your cat coughs, wheezes, or breathes with an open mouth, book a veterinary exam rather than swapping litter and hoping.
Fragrance is the second half of the equation. Heavily perfumed litters can be as irritating as dust for a sensitive cat, and the ASPCA notes that cats generally prefer unscented, fine-grained substrates. Walnut litter has a mild, earthy smell of its own; corn-cassava is close to odourless out of the bag. If you're already managing an itchy or reactive cat with a limited ingredient diet, keeping the litter unscented follows the same logic. Pair it with regular brushing — see our cat grooming tools — since less loose fur in the box means less debris kicked into the air.
Which of the three is best for a household member with allergies?
Sustainably Yours is usually the safest starting point: low dust, no added fragrance in the standard formula, and grain-free households should note it is corn-based, so a truly corn-avoidant home should pick Naturally Fresh walnut instead. Walnut litter is a tree nut product, which matters only for humans with severe nut allergies handling the bag.
Odour control over a full week
Naturally Fresh walnut delivers the strongest ammonia suppression in the first 48 hours because walnut fibre traps moisture inside the granule. Arm & Hammer relies on baking soda plus added odour eliminators and performs most consistently across a full week. Sustainably Yours sits between the two, controlling odour well as long as you scoop daily.
Ammonia is the smell you actually notice, and it forms as bacteria break down urea in urine. Two variables drive it more than brand choice: scooping frequency and box count. The standard veterinary recommendation is one box per cat plus one extra, scooped once or twice daily, with the box measuring at least 1.5 times your cat's body length. A single crowded box will out-stink any premium litter on the market.
Diet plays a quiet role here too. Cats eating primarily dry food produce smaller volumes of highly concentrated urine, which smells sharper in the box; diets with 70 to 78% moisture from canned or raw food produce more dilute urine and larger, easier-to-scoop clumps. Our nutrition experts at the North York store often suggest adding one wet meal a day when a customer complains about box odour. Unlike pet food, litter carries no guaranteed analysis or AAFCO standards — AAFCO regulates feed, not box filler — so odour claims on a litter bag are marketing language, not a regulated nutrient panel. Browse our cat food and supplies collection if you want to adjust moisture intake alongside the litter switch.
How much litter you actually use per month
One adult cat using a properly maintained clumping box consumes roughly 8 to 12 lbs of plant-based litter per month, versus about 15 to 25 lbs of clay, because clay is nearly twice as dense by volume. That density gap is the real cost story: a 26 lb bag of corn-cassava fills about the same box volume as a 40 lb jug of clay.
Here's how the common bag sizes translate into refills for a one-cat home at 3.5 inches of depth:
- Naturally Fresh (14 lb and 26 lb bags) — a 26 lb bag typically covers 2 to 3 weeks of daily scooping plus one full box change.
- Sustainably Yours (13 lb, 26 lb, 40 lb bags) — the 40 lb bag is the volume-efficiency winner and usually runs a single cat close to 5 or 6 weeks.
- Arm & Hammer (14 lb to 40 lb jugs) — a 40 lb jug is heavy to carry but delivers less usable volume than the same weight in plant litter.
Because clumping litters are scooped rather than fully dumped, you should only need a complete change every 3 to 4 weeks — monthly dumping of a well-maintained clumping box wastes 40% or more of the bag. Pet owners tell us their real monthly spend drops sharply once they stop doing weekly full changes out of habit. Prefer a Canadian-made clay option? OdourLock is another clumping clay we carry; see our made in Canada pet products page.
Our store at 1111A Finch Ave W, Unit 2, North York, ON M3J 2P7 is open 7 AM to 11 PM daily, with local delivery available via DoorDash and other apps. That's genuinely useful for litter — 40 lb bags are not a fun subway ride.
Biodegradable vs clay: tracking, flushing, and disposal
Plant-based litters are lighter and compostable in some municipalities, but they track more granules across floors than clay and should not be flushed if your cat could carry Toxoplasma gondii. Clay is heavier, non-biodegradable, and landfill-bound, but its finer particles tend to stay in the box or fall off paws faster.
Walnut litter is the darkest of the three, so tracked granules show up clearly on light flooring — several customers with pale hardwood switched to a high-sided box for this reason alone. Corn-based litter has one seasonal caveat worth knowing in a humid Toronto summer: stored in a damp basement, corn litter can develop mould, so keep the bag sealed and dry. During January, when GTA windows stay shut for weeks, low dust and strong odour control matter far more than they do in June with the balcony door open.
Skip each of these litters if…
Skip Naturally Fresh walnut if your cat is a determined digger and you can't tolerate dark granules on the floor, or if you keep the box shallower than 3 inches. Softer clumps plus thin litter equals stuck-on residue.
Skip Sustainably Yours if you need a corn-free home, if your storage space is humid, or if your cat is one of the rare few who nibbles litter — corn-based granules are more tempting to taste than mineral clay. Kittens under 12 weeks should use a non-clumping litter regardless of brand.
Skip Arm & Hammer clay if you're managing an asthmatic cat, if you carry your litter home on foot, or if biodegradability is a priority. Also skip heavily fragranced clay formulas for any cat with a history of box avoidance.
Side-by-side recap
| Feature | Naturally Fresh | Sustainably Yours | Arm & Hammer |
|---|---|---|---|
| Best for | Fast ammonia control, nut-shell fibre fans | Multi-cat homes wanting clay-like clumps | Maximum clump rigidity, week-long odour |
| Base material | Ground walnut shell (Eco-Shell) | Corn plus cassava starch binder | Sodium bentonite clay plus baking soda |
| Clump strength | Good; softer at the box floor | Very good; starch-bound | Excellent; rigid within 2-5 minutes |
| Dust level | Low | Very low | Reduced, but highest of the three |
| Monthly use, 1 cat | ~8-12 lbs | ~8-12 lbs | ~15-25 lbs |
| Biodegradable | Yes | Yes | No |
| Price tier | $$$ | $$ | $$ |
| Available at Ashario | Shop Naturally Fresh | Shop Sustainably Yours | Shop Arm & Hammer |
Shop the Brands Mentioned in This Article
Find Naturally Fresh, Sustainably Yours, and other premium pet supplies in-store or Browse cat litter online →.
Common questions about switching litter
How do I transition my cat to a new litter without accidents?
Mix 25% new litter into 75% old litter for 4 to 5 days, then move to a 50/50 blend for another 4 to 5 days, then 75% new. Most cats accept a full switch within two weeks. If your cat eliminates outside the box at any stage, drop back to the previous ratio and slow down.
During a transition, offer a second box with the old litter so your cat always has an accepted option. Sudden refusal to use any box is a medical red flag, not just a preference issue — urinary blockage in male cats is an emergency, so call your veterinarian rather than experimenting further. Our cat wellness resources cover what to watch for.
Can I mix walnut and corn-cassava litter together?
Yes, and some owners deliberately do. A roughly 50/50 blend of Naturally Fresh and Sustainably Yours gives you the walnut's rapid ammonia trapping plus the cassava-bound clumps that survive scooping. Keep total depth at 3.5 to 4 inches. Don't blend plant litter with clay — the two settle at different rates and clumping suffers.
Is clumping litter safe for kittens?
Not for very young kittens. Most brands, and general veterinary guidance echoed by the ASPCA, advise waiting until roughly 3 to 4 months of age before introducing clumping litter, since kittens explore by mouth and ingested clumping material can cause problems. Use a plain non-clumping litter until then, then transition gradually.
For broader product picks by household type, our guide to pet food for specific needs and the cat blog go deeper on multi-cat management. You can also check our top pet brands in Canada page or contact our team with box-setup questions.
Bottom line: Sustainably Yours is the best all-around pick for most cats — clay-grade clumping at roughly half the hauling weight, with very low dust. Choose Naturally Fresh walnut if ammonia is your main complaint and dark tracking doesn't bother you, and stick with Arm & Hammer clay if you want the hardest possible clumps and biodegradability isn't a priority.
