Arm & Hammer Ultra Last Unscented Multi-Cat Litter 18 lb
- Capacity: 18 pounds
- Item Display Weight: 18 pounds
- Item Weight: 18 pounds
- Material Type: Mineral And Plant Derivatives
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An unscented, baking-soda-based clumping litter built for multi-cat use, useful when fragrance-free is the priority over a lighter bag.
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ASIN: B09F8CP448Category: Cat Litter
Overview
This 18 lb bag of ARM & Hammer Ultra Last is a clumping, unscented cat litter that leans on baking soda rather than fragrance for odor control in multi-cat homes.
Baking soda is Arm & Hammer's signature odor approach across its product lines, and here it's paired with a granule-form litter built to hold up under multiple cats. Choosing unscented over a fragranced formula matters for cats and owners sensitive to perfumed litter, since fragrance is one of the more common reasons cats avoid a box. The material blend is mineral and plant derivatives rather than pure clay.
- 18 lb bag, granule-form clumping litter
- Unscented formula with baking soda odor control
- Built for multi-cat households
- Mineral and plant-derivative material blend
Who it's for
Multi-cat households wanting fragrance-free odor control are the target buyer here. Owners chasing a lightweight bag should note this is a standard-weight formula.
Pros and cons
- Unscented, avoids fragrance some cats reject
- Baking soda odor control built in
- Rated for multi-cat households
- Standard bag weight, not marketed as lightweight
- Granule texture may feel coarser than pebble-style litter
Performance notes
The granule form is built to clump for scooping while baking soda handles ammonia odor as it builds up across multiple cats and boxes. Because it's unscented, the odor control has to come entirely from the baking soda and mineral blend rather than fragrance masking it.
Specifications
| Brand | Arm & Hammer |
|---|---|
| Dimensions & fit | |
| Item Display Weight | 18 poundshigher than 64% of 128 cat litter |
| Item Weight | 18 poundshigher than 61% of 125 cat litter |
| Capacity & performance | |
| Capacity | 18 poundshigher than 66% of 116 cat litter |
| Construction & materials | |
| Material Type | Mineral And Plant Derivatives |
| Included components | |
| Unit Count | 18 pounds |
| Included Components | Cat Litter |
| Other details | |
| Item Form | Granule |
| Scent Name | Unscented |
| Target Species | Cat |
| Asin | B09F8CP448 |
| Manufacturer | Church & Dwight - Pet |
| Best Sellers Rank | #622 In Pet Supplies (See Top 100 In Pet Supplies) #38 In Cat Litter |
| Manufacturer Part Number | 10033200975462 |
| Item Type Name | Cat Litter |
| Model Number | 033200975465 |
| Customer Reviews | {'ratings_count': '6,961', 'stars': '4.3'} |
| Upc | 033200975465 |
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Frequently asked questions
Is this litter scented?
No, it's an unscented formula.
What handles the odor control if there's no fragrance?
Baking soda mixed into the mineral and plant-derivative litter.
Is it rated for more than one cat?
Yes, it's labeled as a multi-cat formula.