Clumping Clay
Arm & Hammer HardBall
Fast-forming hard clumps with baking soda odor help, making it a strong mid-range clay pick if you can tolerate moderate dust.
Overall score
8.5/10
Cost per day
$0.47
Reviewed Nov 28, 2025
Head-to-head comparison
Arm & Hammer HardBall vs Naturally Fresh Walnut: Which Should You Buy?
HardBall clumps hard for less money. Naturally Fresh held more of its clumps together in our drop test and pours far less dust. It also breaks down naturally after it leaves the house, and that dust reading is the honest reason to switch.
ReviewCatLitter editorial teamUpdated Nov 28, 2025
This comparison page is maintained by the ReviewCatLitter editorial team and grounded in the same scoring framework used across the published review catalog.
Walnut Shell (Natural)
Naturally Fresh Walnut
A walnut-shell litter that clumps harder than many natural competitors and absorbs odor naturally without added fragrance.
Overall score
8.8/10
Cost per day
$0.54
Reviewed Nov 18, 2025
Overall winner
Naturally Fresh Walnut
Naturally Fresh Walnut is the strongest all-around pick in this comparison for natural clumping without corn.
Lowest daily cost
Arm & Hammer HardBall at $0.47/day
Budget is often the deciding factor in this tier.
Best odor control
Naturally Fresh Walnut at Strong natural absorption
Odor control often decides whether a litter feels tolerable long term.
Tracks less outside the box
Naturally Fresh Walnut at Moderate
Tracking can be more important than overall score in small spaces.
What we actually measured
Every figure below is a reading from our own test runs, not a rating. Where a run never took a reading it says so.
| Reading | Arm & Hammer HardBall | Naturally Fresh Walnut | Gap |
|---|---|---|---|
| Dust weighed per pourParticulates caught in the air while the bag goes into the box. Lower is better. | 0.48 mg | 0.13 mgbetter | 0.35 mg |
| Clumps that survived the drop testShare of clumps still whole after a three-foot drop. Higher is better. | 87% | 89%better | 2 points |
| Bag priceWhat the tested bag cost. Bag sizes differ, so read it next to cost per pound. | $19.99 | $24.99 | $5.00 |
| Cost per poundBag price divided by what is in the bag. Lower is better. | $0.53better | $0.96 | $0.43 |
| Cost per dayWhat the box costs to keep running each day. Lower is better. | $0.47better | $0.54 | $0.07 |
| Cost across a yearThat daily cost carried over a full year of use. Lower is better. | $172better | $197 | $25 |
Neither run recorded granules outside the box, ammonia after one day and ammonia after three days, so those rows are left out rather than filled in from a similar bag. The full test data shows every reading we have.
Why Naturally Fresh Walnut wins this matchup
Primary tradeoff: Naturally Fresh Walnut's weakest area here is tracking.
Best dust control here at 0.13mg per pour.
Strongest odor control in this set with strong natural absorption.
It still lands a stronger overall score than cheaper options because it is more balanced.
| Product | ||
|---|---|---|
| Overall Score | 8.5 | 8.8 |
| Pricing | ||
| Price | $19.99 | $24.99 |
| Weight | 38 lbs | 26 lbs |
| Cost / Day | $0.47 | $0.54 |
| Performance | ||
| Dust Control | 6 0.48mg per pour | 8.1 0.13mg per pour |
| Clumping | 9 Hard and fast | 8.9 Hard for natural litter |
| Odor Control | 8 Baking soda support | 8.4 Strong natural absorption |
| Tracking Outside the Box | 6 Moderate | 7.4 Moderate |
| Value for Cost | 8 $0.47/day · $19.99 | 8.1 $0.54/day · $24.99 |
| Features | ||
| Type | Fast-Clumping Clay | Walnut Shell |
| Flushable | ||
| Scented | Yes | No |
| Our Verdict | ||
| Best For | Fast hard clumping on a mid-range budget | Natural clumping without corn |
| Read ReviewCheck Price | Read ReviewCheck Price | |
Best fit
Arm & Hammer HardBall
Arm & Hammer HardBall makes the most sense for fast hard clumping on a mid-range budget.
Worth it if
You want fast-forming hard clumps with baking soda odor help, making it a strong mid-range clay pick if you can tolerate moderate dust.
Skip it if
You need a formula that solves natural clumping without corn better.
Best fit
Naturally Fresh Walnut
Naturally Fresh Walnut makes the most sense for natural clumping without corn.
Worth it if
You want a walnut-shell litter that clumps harder than many natural competitors and absorbs odor naturally without added fragrance.
Skip it if
You need a formula that solves natural clumping without corn better.
If neither option is quite right
The closest litters we have tested to this matchup, on score and on price.
Silica Crystal
PrettyLitter
Runs at $0.80 a day. Its dust was never weighed.
Best for health monitoring and lightweight convenience
Soft Wood / Pine
Catalyst Soft Wood
Weighed 0.15mg per pour and runs at $0.72 a day.
Best for cats that reject pellets
Clumping Clay
Dr. Elsey's Ultra
Weighed 0.03mg per pour and runs at $0.51 a day.
Best for dust-sensitive homes
Read the full reviews
Use this page to choose a winner quickly, then open the full product reviews if you want the long-form test notes.
Keep comparing nearby options
Related matchups that share one of the same products and answer the next likely decision.
Related matchup
Dr. Elsey's Ultra vs Arm & Hammer HardBall
Ultra is the cleaner litter. HardBall is the cheaper way to get clumps that set fast and come out in one piece.
Winner: Dr. Elsey's Ultra
Related matchup
Arm & Hammer Clump & Seal vs Arm & Hammer HardBall
Two Arm & Hammer clays built for different things. Clump & Seal is about fragrance and a low bag price.
Winner: Arm & Hammer Clump & Seal
Related matchup
Dr. Elsey's Ultra vs Naturally Fresh Walnut
Ultra holds its clumps better and pours less dust. Naturally Fresh is the plant litter that gets closest to it, for a little more per day.
Winner: Dr. Elsey's Ultra
Related matchup
Arm & Hammer Clump & Seal vs Naturally Fresh Walnut
Naturally Fresh is the way out of fragrance and heavy dust without paying premium clay money.
Winner: Naturally Fresh Walnut
Related matchup
Naturally Fresh Walnut vs Sustainably Yours
Naturally Fresh is the cheaper natural bag and clumps nearly as hard. Sustainably Yours flushes and tracks less.
Winner: Sustainably Yours
Related matchup
Naturally Fresh Walnut vs World's Best Cat Litter
Corn against walnut. World's Best flushes and barely leaves the tray. Naturally Fresh held more clumps together in our drop test and costs less per day.
Winner: Naturally Fresh Walnut
Quick Answers
Which is better: Arm & Hammer HardBall or Naturally Fresh Walnut?
Naturally Fresh Walnut comes out ahead on the balance of dust, clumping, odor control, tracking and daily cost. Arm & Hammer HardBall is still the one to buy for fast hard clumping on a mid-range budget.
Which is cheaper per day: Arm & Hammer HardBall or Naturally Fresh Walnut?
Arm & Hammer HardBall runs at $0.47 a day against $0.54 for Naturally Fresh Walnut.
Which controls smell better: Arm & Hammer HardBall or Naturally Fresh Walnut?
Naturally Fresh Walnut scored higher: strong natural absorption, against baking soda support for Arm & Hammer HardBall.
Which tracks less outside the litter box: Arm & Hammer HardBall or Naturally Fresh Walnut?
Naturally Fresh Walnut keeps more litter in the box: moderate, against moderate for Arm & Hammer HardBall.