Here is the thing almost every review of this brand buries: all three Sustainably Yours formulas contain exactly the same ingredients.
Corn and cassava. That is it. Small grain, large grain and mixed grain are not different recipes.
The only variable is how big the granules are, and that single difference decides whether you get better clumps or less litter tracked across your floor. You cannot have both.
- Sustainably Yours cat litter is made from just two plant ingredients, corn and cassava, and is biodegradable.
- All three Sustainably Yours formulas contain identical ingredients and differ only in granule size.
- Small-grain Sustainably Yours clumps hardest, large-grain tracks least, and mixed-grain balances both.
- Sustainably Yours is one of the lowest-dust litters available, which suits cats and people with respiratory sensitivity.
- The litter is marketed as flushable, but flushing cat waste is restricted in some US states and carries a parasite risk to wildlife.
Our Top Picks
Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 10-lb bag
Sustainably Yours Small-Grain Formula Unscented Clumping Cat Litter, 10-lb bag
Sustainably Yours Large-Grain Formula Unscented Clumping Cat Litter, 10-lb bag
Which Sustainably Yours grain size should you buy?
| Product | Best for | Size | Price | Grain |
|---|---|---|---|---|
| Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 10-lb bag | Best overall | 10-lb bag | $20.89 | Mixed grain |
| Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 20-lb bag | Best value | 20-lb bag | $39.99 | Mixed grain |
| Sustainably Yours Small-Grain Formula Unscented Clumping Cat Litter, 10-lb bag | Best clumping | 10-lb bag | $21.99 | Small grain |
| Sustainably Yours Small-Grain Formula Unscented Clumping Cat Litter, 20-lb bag | Best clumping value | 20-lb bag | $39.99 | Small grain |
| Sustainably Yours Large-Grain Formula Unscented Clumping Cat Litter, 10-lb bag | Best low tracking | 10-lb bag | $21.99 | Large grain |
| Sustainably Yours Large-Grain Formula Unscented Clumping Cat Litter, 20-lb bag | Best low tracking value | 20-lb bag | $39.99 | Large grain |
Grain size is the whole decision
Sustainably Yours sells three formulas made of the same corn and cassava. Choosing between them means choosing which problem you would rather have.
Small grain clumps better. Fine particles pack tightly around urine, so clumps set fast and hold together on the scoop. Fine particles also lodge between toe pads and ride out of the box on your cat’s feet.
Large grain tracks less. Bigger granules are too heavy and too bulky to wedge into paws, so they stay in the box. Those same bigger granules leave more air gaps around urine, so clumps are softer and need a gentler scoop.
Mixed grain splits the difference, and it is the right default. Buy this one unless you already know which of the two problems annoys you more.
One thing common to all three: this is one of the lowest-dust litters on the market. Plant granules do not shatter into airborne particles the way clay does, which matters if anyone in the house, cat or human, has asthma. Dust is the reason plenty of people leave clay litter behind in the first place.
About flushing it, honestly
Sustainably Yours is marketed as flushable, and the clumps do break down after soaking. Whether you should flush them is a different question, and the honest answer is usually no.
Cat faeces can carry Toxoplasma gondii, a parasite that survives standard wastewater treatment. Flushed cat waste has been linked to toxoplasmosis reaching coastal waters and infecting marine wildlife, including sea otters. This is why some US jurisdictions restrict it: California requires cat litter packaging to carry a warning against flushing, and Rhode Island has its own restriction.
There is also a plumbing argument. Older pipes, septic systems and low-flow toilets do not handle litter clumps well, and a blockage costs more than a year of bin bags.
The practical position: bag it and bin it. The environmental case for this litter is that it is biodegradable and made from renewable crops rather than strip-mined clay, and that case stands on its own without flushing. The CDC covers toxoplasmosis and safe litter handling, which matters especially if anyone in the house is pregnant or immunocompromised.
The 6 Sustainably Yours products, reviewed
Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 10-lb bag: best overall
Mixed grain is the one to buy if you are not sure. It combines small and large granules, so you get clumping close to the small-grain formula and tracking closer to the large. Most households do not need to optimise harder than this, and the 10-lb bag is the low-risk way to find out if your cat accepts it.
Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 20-lb bag: best value
The same mixed-grain formula in the bigger bag, and the sensible reorder once your cat has accepted it. Buy the small bag first to test, then switch to this. Plant litters absorb ambient moisture over months, so store the open bag sealed and somewhere dry.
Sustainably Yours Small-Grain Formula Unscented Clumping Cat Litter, 10-lb bag: best clumping
Small grain gives the hardest, fastest clumps in the range, because finer particles pack tighter around moisture. This is the formula to pick if clumps breaking apart on the scoop is your main complaint. The trade is that fine grains travel on paws more readily.
Sustainably Yours Small-Grain Formula Unscented Clumping Cat Litter, 20-lb bag: best clumping value
Small grain in the 20-lb bag. Worth it for multi-cat homes, where clump integrity matters most because the box gets worked harder and a clump that crumbles turns into a box you have to empty completely.
Sustainably Yours Large-Grain Formula Unscented Clumping Cat Litter, 10-lb bag: best low tracking
Large grain is the answer to litter across the hallway. Bigger granules are too heavy to wedge between toe pads, so far less leaves the box. Clumping is softer than the small-grain formula, so scoop gently and expect to work a little harder for intact clumps.
Sustainably Yours Large-Grain Formula Unscented Clumping Cat Litter, 20-lb bag: best low tracking value
Large grain in the bigger bag. This is the combination to pair with a good litter mat if tracking is the problem you are actually trying to solve, since the two together do more than either alone.
How to switch litter without a protest
Cats form strong preferences about what they stand on, and an abrupt switch is one of the most common causes of a cat going outside the box. Corn and cassava feel nothing like clay underfoot, so this is a switch worth doing slowly.
- Start at roughly 25 percent new litter mixed into the old, for about a week.
- Move to half and half for another week if there are no protests.
- Go to 75 percent new for a week, then complete the switch.
- Keep one box on the old litter throughout if you have the space, so your cat always has a familiar option and never has to choose the carpet.
If your cat starts going outside the box at any stage, go back a step. And if the avoidance continues once you have returned to the old litter, that is a vet visit rather than a litter problem.
Who should buy Sustainably Yours
Buy it if you want to move off clay for environmental or dust reasons and you want clumping that actually competes with clay. Among plant litters, the clumping here is genuinely at the top end, which is where most natural litters fall down.
Skip it if you want the cheapest cost per pound, where clay wins comfortably. Compare across types in our best cat litter guide and best clumping cat litter, or see World’s Best for the other major corn-based option.
The bottom line on Sustainably Yours
Two plant ingredients, biodegradable, very low dust, and clumping strong enough to stand next to clay. For a natural litter that is a genuinely good combination, and the clumping is where most competitors disappoint.
Ignore the flushable claim and bag it instead. Pick mixed grain unless you already know whether clumping or tracking annoys you more, and start with Sustainably Yours Mixed-Grain Formula Unscented Clumping Cat Litter, 10-lb bag. This article is educational rather than veterinary advice.
Frequently asked questions
Q: Is Sustainably Yours a good cat litter?
Sustainably Yours is one of the better plant-based clumping litters available. It is made from corn and cassava, is biodegradable, produces very little dust, and clumps well enough to compete with clay, which is where most natural litters fall short.
Q: What is the difference between small, large and mixed grain?
Nothing except granule size. All three formulas contain the same corn and cassava. Small grain clumps hardest, large grain tracks least, and mixed grain balances the two. Mixed grain is the sensible default.
Q: What is Sustainably Yours cat litter made of?
Sustainably Yours is made from just two plant ingredients, corn and cassava. It contains no clay, and it is biodegradable and made from renewable crops rather than strip-mined material.
Q: Can you flush Sustainably Yours cat litter?
It is marketed as flushable, but flushing cat waste is not recommended. Cat faeces can carry Toxoplasma gondii, a parasite that survives wastewater treatment and has been linked to infections in marine wildlife. California requires a warning against flushing on cat litter packaging.
Q: Does Sustainably Yours track a lot?
The large-grain formula tracks the least, because bigger granules are too heavy to wedge between toe pads. Small grain tracks most. Pairing large grain with a litter mat is the most effective combination if tracking is your main complaint.
Q: Is Sustainably Yours low dust?
Yes. It is one of the lowest-dust litters on the market, because plant granules do not shatter into airborne particles the way clay does. That matters if a cat or person in the household has asthma or respiratory sensitivity.
Q: How do I switch my cat to a new litter?
Switch gradually over three to four weeks, starting at about 25 percent new litter and increasing weekly. Keep one box on the old litter throughout if you have space, so your cat always has a familiar option rather than choosing the carpet.
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