Arm & Hammer Ultra Last Unscented Multi-Cat Litter 18 lb
- 18 pound bag, 288 ounces
- Unscented, multi-cat clumping litter
- Baking soda odor control
- Mineral and plant derivatives base
- Pet friendly, granule form
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
An unscented clumping litter with baking soda for homes with more than one cat. The mineral and plant mix replaces plain clay.
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ASIN: B09F8CP448Category: Cat Litter
Overview
Arm and Hammer Ultra Last is a clumping granule litter blended from mineral and plant derivatives, with baking soda added for odor control. It has no fragrance and is aimed at multi-cat homes.
Baking soda handles smell without perfume, so cats and owners that dislike scent are covered. The unscented formula and large bag suit regular use by several cats. Dust and tracking figures are not given.
Who it's for
Households with two or more cats sharing a box who want odor control from baking soda rather than perfume. The bag size works for a steady restock. Anyone wanting lavender or another scent should choose a scented line.
Pros and cons
- Baking soda odor control
- Clumping for easy scooping
- Pet friendly claim
- Large bag for multi-cat use
- Dust level not listed
- Flushability not listed
- Not a lightweight formula
Performance notes
Granules bind into clumps when wet, so frequent scooping holds odor down and the box usable. Baking soda absorbs smell rather than covering it. Cat count and box size decide how long an eighteen pound bag lasts.
Specifications
| Brand | Arm & Hammer |
|---|---|
| Dimensions & fit | |
| Item weight | 18 pounds |
| Capacity & performance | |
| Capacity | 18 poundshigher than 65% of 112 cat litter |
| Construction & materials | |
| Material Type | Mineral and plant derivatives |
| Included components | |
| Unit Count | 288 ounces |
| Other details | |
| Item Form | Granule |
| Scent Name | Unscented |
| Target Species | Cat |
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Frequently asked questions
How often should I scoop Arm and Hammer Ultra Last?
The listing gives no schedule. As a clumping litter, clumps are scooped out and the box topped up.
Is it scented?
No. The scent is listed as unscented.
Is it made for several cats?
Yes. The title says multi cat.
What is it made of?
The material is listed as mineral and plant derivatives with baking soda for odor control.