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Last updated on October 5, 2026
This Naturally Fresh cat litter review compares three of the brand’s walnut shell clumping formulas: Multi-Cat, Quick-Clumping and Ultra Odor Control. These are the three unscented options we’re focusing on, so the real question is what separates them and which one suits your box. Below you’ll see how they differ and what reviewers report.
Naturally Fresh Multi-Cat is the pick for most homes with two or more cats. Quick-Clumping is the simplest of the three, positioned for one or two cats. Ultra Odor Control is for boxes where odor is the biggest complaint.
New to walnut litter? Our walnut cat litter guide covers the color, tracking and switching questions that apply to all three.
Quick Picks
Best for Two or More Cats: Naturally Fresh Multi-Cat
Simplest Formula: Naturally Fresh Quick-Clumping
Most Odor-Focused Formula: Naturally Fresh Ultra Odor Control
Naturally Fresh Cat Litter Formulas Compared
| Formula | Made For (per the brand) | What It Adds to the Walnut Base |
|---|---|---|
| Multi-Cat | Multiple cats, or one cat | A malodor counteractant |
| Quick-Clumping | One or two cats | No extra odor-control feature highlighted by the brand |
| Ultra Odor Control | Households that want maximum odor control | Fresh Shield Probiotic |
Naturally Fresh Multi-Cat
Why It Stands Out
Naturally Fresh adds a malodor counteractant to the walnut base, aimed at the heavier load of a shared box. Most reviewers say odor stays down, including people comparing it directly with clay.
One owner with three cats who has also fostered more than 70 kittens and mother cats relies on it. Another says it kept odor in check in a humid bathroom with no window. Several reviewers also use it in sifting litter boxes.
Possible Downsides
Not every reviewer is convinced. Some say the clumps break apart more than they’d like, or that odor control fell short of what they expected.
Best For
Two or more cats sharing a box.
Naturally Fresh Quick-Clumping
Why It Stands Out
This is the simplest of the three formulas we’re comparing. Naturally Fresh doesn’t highlight an added malodor counteractant or probiotic for Quick-Clumping and positions it for one or two cats.
Reviewers praise how little dust it makes and say it controls odor without a perfume smell covering things up.
Possible Downsides
One reviewer who tried both formulas found Multi-Cat clumped better.
Best For
A single cat or two, and anyone who wants the simplest Naturally Fresh formula.
Naturally Fresh Ultra Odor Control
Why It Stands Out
Naturally Fresh calls this its maximum odor-control formula. It adds Fresh Shield Probiotic, which the brand describes as a patented natural enzyme designed to tackle fecal and ammonia odors.
Most reviewers report solid clumping. One with 40 years of owning and fostering cats called its odor control genuinely strong.
Naturally Fresh reformulated Ultra in 2025 to add the probiotic, so older reviews may describe the previous version.
Possible Downsides
Unlike Quick-Clumping, Ultra includes an additional odor-control ingredient, Fresh Shield Probiotic. If you want the simplest walnut formula of the three, Quick-Clumping is the closer fit.
Best For
Busy boxes where odor is the main complaint.
Frequently Asked Questions
Who makes Naturally Fresh cat litter?
Eco-Shell, LP, based in Corning, California. The walnut shells come from Crain Walnut Shelling, a California walnut processor.
Is Naturally Fresh scented?
Not these three. All three formulas compared here are sold unscented, and the brand says the walnut shells handle odor without relying on perfume.
How much Naturally Fresh should I put in the box?
Naturally Fresh’s directions say to fill a clean box with three inches.
Does Naturally Fresh work in automatic litter boxes?
It depends on the machine. Check your box’s manual for the litter types it supports before you pour.
What if someone in my home has a walnut or nut allergy?
Naturally Fresh says not to use its litter if there’s potential for an anaphylactic reaction. If that applies in your home, choose another litter material.
