# Best Self-Cleaning Litter Box for Multiple Cats (2026)

> The best self-cleaning litter boxes for two to five cats: maker cat limits, real drawer capacity, weight-based cat ID, and why the n+1 box rule still applies.

- Source: https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-box-for-multiple-cats/
- Markdown version: https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-box-for-multiple-cats.md
- Last updated: 2026-11-12

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- The Best Self-Cleaning Litter Box for Multiple Cats in 2026

 Multi-cat
# The Best Self-Cleaning Litter Box for Multiple Cats in 2026
  Updated November 12, 2026 By [Self-Cleaning Litter Box Guide Editorial Team](https://selfcleaninglitterboxguide.com/about/) [How we research](https://selfcleaninglitterboxguide.com/how-we-research/)

Prices are approximate and change often, so check the current price before you buy.

## Key takeaways

- Only Whisker publishes a firm cat count: **Litter-Robot 4** up to four cats, **Litter-Robot 5** up to five, **EVO** up to two.
- PETKIT, Neakasa and Lesure don't give a cat count, so judge them by bin size and how often reviewers emptied them.
- Drawer claims are for one cat. PETKIT's bag listing suggests changing bags twice a week for two cats, and WIRED's ELS PET Orbitie filled every other day with two.
- The AAFP still advises one box per cat plus one. An automatic box reduces the scooping, not the need for a backup box in another spot.
- Crystal-tray boxes get expensive fast with two cats: trays last 10–15 days instead of about a month.

## Our top picks

- 1![Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-4.CZhanV3w_12M27U.webp)Best for three or four cats: rated for up to four cats, app tells cats apart by weight, about $699–749[Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/)Rotating globe · 3–25 lb · up to 4 cats8.7**$$$**$PremiumPrice tier: Premium[Check price on Amazon](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20)
- 2![Whisker Litter-Robot 5](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-5.JMut0Qu8_Z1BLhyu.webp)Best for five cats: highest cat count and weight limit here, about $799[Whisker Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/)Rotating globe · 3–30 lb · up to 5 cats8.5**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20)
- 3![PETKIT Purobot Max Pro 2](https://selfcleaninglitterboxguide.com/_astro/petkit-purobot-max-pro-2.tJpodhLt_Zt19WQ.webp)Best camera ID: recognizes cats by face and weight, 8 L bin, about $500–550[PETKIT Purobot Max Pro 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-purobot-max-pro-2/)Tilting drum · 3.3–22 lb · cats: not stated8.6**$$**$$Mid-rangePrice tier: Mid-range[Check price](https://www.amazon.com/dp/B0DFYLFFG1?tag=selfcleaninglitterboxguide.com-20)
- 4Best value for two cats: entrance stays open while cycling, about $390–400[PETKIT PuraMax 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-puramax-2/)Tilting drum · 3.3–22 lb · cats: not stated8.5**$$**$$Mid-rangePrice tier: Mid-range[Check price](https://www.amazon.com/dp/B0DFYF2D7D?tag=selfcleaninglitterboxguide.com-20)
- 5![Whisker Litter-Robot EVO](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-evo.qVzR9iO0_sr869.webp)Best for exactly two cats in a small space: rated for two cats of 3–19 lb, about $599[Whisker Litter-Robot EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/)Rotating globe · 3–19 lb · up to 2 cats8.6**$$$**$PremiumPrice tier: Premium[Check price](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20)

### On this page 8 sections

- [The shortlist](#the-shortlist)
- [The n+1 rule still applies](#the-n1-rule-still-applies)
- [What “multi-cat” actually means on a spec sheet](#what-multi-cat-actually-means-on-a-spec-sheet)
- [Our picks](#our-picks)
- [What two cats cost over five years](#what-two-cats-cost-over-five-years)
- [Safety in a multi-cat home](#safety-in-a-multi-cat-home)
- [How to pick](#how-to-pick)
- [FAQ](#faq)

## Before you choose

- [How Many Litter Boxes Per Cat? The n+1 Rule, With or Without an Automatic Box](https://selfcleaninglitterboxguide.com/posts/how-many-litter-boxes-per-cat/)
- [The 8 Best Self-Cleaning Litter Boxes of 2026, Ranked for Safety and Value](https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-boxes-2026/)
- [Litter-Robot 5 vs Litter-Robot 4 vs EVO: Which Litter-Robot to Buy in 2026](https://selfcleaninglitterboxguide.com/posts/litter-robot-5-vs-litter-robot-4-vs-evo/)

Several cats is the situation where a self-cleaning litter box pays off most, and also where the wrong box fails fastest. A drawer rated for two weeks with one cat can be full in a few days with three. Cat-count limits vary, and some makers don’t publish one at all. And the old rule about how many boxes you need doesn’t go away.

We haven’t tested these boxes ourselves. This guide is based on maker specs, Amazon listing text and independent testing, mainly by WIRED and Tom’s Guide, and we name the outlet whenever a test result appears. Prices are typical street prices from dated sources, so check today’s price.

## The shortlist

| Box | Maker cat limit | Cat weight | Waste capacity | Real-world emptying | Cat ID | Price |
| --- | --- | --- | --- | --- | --- | --- |
| [Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) | Up to 4 | 3–25 lb | Drawer; as rarely as every 8 days (Whisker) | Not reported for multi-cat | By weight (Tom’s Guide) | ~$699–749 |
| [Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/) | Up to 5 | 3–30 lb | Drawer | About 10 days, two cats (WIRED) | By weight, needs Whisker+ | ~$799 |
| [Purobot Max Pro 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-purobot-max-pro-2/) | Not stated | 3.3–22 lb | 8 L, up to 17 days one cat | Not reported for multi-cat | Face + weight, up to 15 cats | ~$500–550 |
| [PuraMax 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-puramax-2/) | Not stated | 3.3–22 lb | 7 L, up to 15 days one cat | Bags twice a week, two cats (listing) | No | ~$390–400 |
| [Litter-Robot EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/) | Up to 2 | 3–19 lb | Drawer | About weekly, one cat (WIRED) | Weight tracking | ~$599 |
| [Neakasa M1](https://selfcleaninglitterboxguide.com/litter-boxes/neakasa-m1/) | Not stated | 2.2–33 lb | 11.23 L, up to 14 days one cat | Not reported for multi-cat | Not confirmed | ~$360–450 |

## The n+1 rule still applies

The AAFP’s client guide on house-soiling is clear: one litter box for each cat, plus one extra, in multiple locations. The MSD Veterinary Manual says the same, adding a box on each floor of a multi-floor home. The AAFP also notes that cats may treat boxes placed side by side as a single box, so spread them out.

WIRED takes a slightly softer line for automatic boxes. Because they clean after every visit, there’s less need for multiple options, but WIRED still recommends keeping your old box out until your cat uses the new one regularly. We’d keep at least one manual box in a second location permanently. It covers you when the robot is offline, mid-error or being cleaned.

Work out your number with the [how many litter boxes calculator](https://selfcleaninglitterboxguide.com/tools/how-many-litter-boxes/#cats=3), and read [how many litter boxes per cat](https://selfcleaninglitterboxguide.com/posts/how-many-litter-boxes-per-cat/) for placement.

## What “multi-cat” actually means on a spec sheet

### Cats-per-box limits

Whisker is the only brand here with firm numbers: up to four cats for the Litter-Robot 4, five for the Litter-Robot 5 and two for the EVO. Chewy’s listing says the ScoopFree Crystal Smart is designed for one or two cats. PETKIT sells the PuraMax 2 as a multi-cat box but gives no number. PetSafe calls the SmartSpin ideal for multi-cat homes without a number. Neakasa and Lesure don’t publish one either.

Where there’s no number, don’t assume a high one. Look at bin size and how often testers emptied it.

### Drawer capacity

Most capacity claims are for one cat. PETKIT rates the PuraMax 2’s 7 L bin for up to 15 days for a single cat, and that’s a lab figure. PETKIT’s own bag listing suggests changing bags twice a week for two average-sized cats. WIRED’s ELS PET Orbitie bin filled about every other day with two cats, which is a dealbreaker for most multi-cat homes.

The best multi-cat data point is the Litter-Robot 5, which held about 10 days of waste from two cats in WIRED’s testing. Tom’s Guide also found the Litter-Robot 4 can keep cycling after the app says the bin is full, so don’t treat a “full” alert as a hard stop, and don’t let it overflow either.

### Weight-based cat ID

Many apps log each visit with the cat’s weight, which can help you spot a change in one cat’s habits. Tom’s Guide found the Litter-Robot 4 app tells cats apart by weight. The Purobot Max Pro 2 adds a camera and recognizes up to 15 cats by face and weight, per PETKIT, but WIRED says cat ID got confused for some testers after the free Care+ trial ended. The Litter-Robot 5’s weight-based cat ID needs Whisker+ (about $80 a year, per WIRED) and worked only intermittently during WIRED’s first four months.

Treat cat ID as a useful extra, not a reason to buy one box over another.

## Our picks

### Whisker Litter-Robot 4: Best for three or four cats

The [Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/) is rated for up to four cats from 3 to 25 lb, with a laser curtain and weight sensors that pause the globe when a cat enters. WIRED counts it among its picks, all of which stay open while cycling. The app warns when litter is low or the drawer is full, and the optional LitterHopper (about $129 at Whisker) can refill litter, though it intermittently stopped working in WIRED’s long-term test.

With four cats it will work hard. WIRED’s unit began sensing ghost cats after about two years, and Tom’s Guide’s unit squeaked without maintenance. Budget for liners and filters: Whisker says one carbon filter per cat. About $699–749. [Check the Litter-Robot 4 price](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20).

### Whisker Litter-Robot 5: Best for five cats

The [Litter-Robot 5](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-5/) is the only box here rated for five cats, from 3 to 30 lb. Whisker pairs multiple lasers with weight sensors, and WasteID separates urine and stool visits, which is more useful in a busy box. WIRED emptied it about every 10 days with two cats.

The health features need Whisker+, and WIRED found them unreliable for months before firmware updates helped. WIRED reviewed it but didn’t make it a pick, so we can’t cite WIRED’s open-entry criterion for it. About $799 for the robot at Whisker. [Check the Litter-Robot 5 price](https://www.amazon.com/dp/B0HN8C8TFM?tag=selfcleaninglitterboxguide.com-20), or compare it in [Litter-Robot 5 vs 4 vs EVO](https://selfcleaninglitterboxguide.com/posts/litter-robot-5-vs-litter-robot-4-vs-evo/).

### PETKIT Purobot Max Pro 2: Best camera ID

The [Purobot Max Pro 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-purobot-max-pro-2/) is WIRED’s new favorite. Its 8 L bin is rated for up to 17 days with one cat, and the 10.51 × 10.74 in entry suits bigger cats: WIRED’s 17-lb cat used it easily. Twelve safety sensors stop the drum when a pet is nearby, per PETKIT.

PETKIT publishes no cats-per-unit figure, so for three or more cats, plan on more frequent emptying. PETKIT says cats over 3.3 lb and older than 6 months. About $500–550. [Check the Purobot Max Pro 2 price](https://www.amazon.com/dp/B0DFYLFFG1?tag=selfcleaninglitterboxguide.com-20).

### PETKIT PuraMax 2: Best value for two cats

The [PuraMax 2](https://selfcleaninglitterboxguide.com/litter-boxes/petkit-puramax-2/) is WIRED’s best option for most people, and its entrance stays open while the drum turns, per PETKIT and cats.com. For two average-size cats it’s the cheapest well-reviewed option. The limits are the 7 L bin and a small entry that WIRED’s 17-lb cat found cramped. Expect bag changes about twice a week with two cats, per PETKIT’s bag listing. About $390–400. [Check the PuraMax 2 price](https://www.amazon.com/dp/B0DFYF2D7D?tag=selfcleaninglitterboxguide.com-20), and stock up on [PETKIT bags](https://www.amazon.com/dp/B0DK3KDMW1?tag=selfcleaninglitterboxguide.com-20).

### Whisker Litter-Robot EVO: Best for exactly two cats

The [EVO](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-evo/) is rated for two cats of 3–19 lb in a 20.6 × 24.3 in footprint. WIRED found it near-silent with virtually no odor. It uses weight sensors only and has no litter-level sensing. A third cat, or a cat over 19 lb, means the Litter-Robot 4. About $599. [Check the EVO price](https://www.amazon.com/dp/B0G6GDC4VN?tag=selfcleaninglitterboxguide.com-20).

### Worth a look: Neakasa M1

The [Neakasa M1](https://selfcleaninglitterboxguide.com/litter-boxes/neakasa-m1/) has the biggest bin here at 11.23 L, rated for up to 14 days with one cat. Tom’s Guide’s cats used it 51 times in one week. Neakasa gives no cat count, the open top scatters litter, and WIRED didn’t recommend the original M1 over safety, sensor and counterfeit concerns, choosing the M1 Plus instead. [Check the Neakasa M1 price](https://www.amazon.com/dp/B0DP8XYYKC?tag=selfcleaninglitterboxguide.com-20).

## What two cats cost over five years

Running costs scale with cats; the box price doesn’t. This chart uses our default assumptions for two cats: the lowest typical box price, maker-priced liners, filters or trays, and clumping litter.

[[chart:cost2]]

With those assumptions, the PuraMax 2 comes to roughly $1,600 over five years for two cats, the Litter-Robot 4 to roughly $2,470 and the Litter-Robot 5 to roughly $2,570. Crystal-tray boxes are the trap: a Chewy answer says a ScoopFree tray lasts 10–15 days with two cats, so the ScoopFree Classic reaches about $3,040 despite its $100 price. Change cats, years and litter price in the [cost calculator](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/#cats=2&years=5).

## Safety in a multi-cat home

More cats means more chances that one jumps in mid-cycle. Every box we recommend has sensors meant to pause the cycle when a cat enters, and WIRED won’t recommend boxes that close completely while cleaning. WIRED also flags the Pet Zone Smart Scoop, whose rake doesn’t stop if something jumps in.

- **Every cat must clear the minimum.** If a kitten or small cat below the maker’s minimum shares the box, run it with automatic cleaning off or give that cat its own manual box. Check each cat in the [safety checker](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/#cats=3&weight=8).

- **Use schedules or do-not-disturb.** WIRED recommends using them.

- **Keep the backup box.** See above.

Our [safety guide](https://selfcleaninglitterboxguide.com/posts/are-self-cleaning-litter-boxes-safe/) covers the rest. If odor builds up with several cats, see [self-cleaning litter box odor fixes](https://selfcleaninglitterboxguide.com/posts/self-cleaning-litter-box-odor-fixes/).

## How to pick

- **Two average cats, tight budget:** PuraMax 2.

- **Two cats, small apartment:** Litter-Robot EVO.

- **Three or four cats:** Litter-Robot 4, plus a manual backup box elsewhere.

- **Five cats, or a big cat in the mix:** Litter-Robot 5.

- **You want to see who used the box:** Purobot Max Pro 2.

The [litter box matcher](https://selfcleaninglitterboxguide.com/tools/litter-box-matcher/#cats=3) filters the full lineup by cat count, and the [comparison chart](https://selfcleaninglitterboxguide.com/litter-boxes/) lists every limit side by side.

## Don't guess. Calculate.

- [🐾 Safety checker](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/): which boxes fit your cat
- [💵 Cost calculator](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/): 1-, 3- and 5-year totals
- [🎯 Litter box matcher](https://selfcleaninglitterboxguide.com/tools/litter-box-matcher/): ranked for your home
- [📊 Compare every box](https://selfcleaninglitterboxguide.com/litter-boxes/): sortable spec table

## Frequently asked questions

### What is the best self-cleaning litter box for multiple cats?
For three or four cats, the Whisker Litter-Robot 4: Whisker rates it for up to four cats from 3 to 25 lb, and Tom's Guide found its app tells cats apart by weight. For five cats, the Litter-Robot 5 is rated for up to five cats from 3 to 30 lb. For two average-size cats on a budget, the PETKIT PuraMax 2.

### How many cats can share one self-cleaning litter box?
Use the maker's number where there is one: up to four for the Litter-Robot 4, five for the Litter-Robot 5, two for the EVO, and one or two for the ScoopFree Crystal Smart per Chewy's listing. PETKIT, Neakasa and Lesure publish no cat count. Even within those limits, the AAFP advises one box per cat plus one extra.

### Can a self-cleaning litter box tell my cats apart?
Some can. Tom's Guide found the Litter-Robot 4 app tells cats apart by weight. The Purobot Max Pro 2 uses a camera and weight and recognizes up to 15 cats, per PETKIT, though WIRED says cat ID got confused for some testers after the free Care+ trial. The Litter-Robot 5's cat ID needs Whisker+ and was intermittent in WIRED's first four months.

### How often do I empty a self-cleaning litter box with two cats?
More often than the box says. Maker figures are usually for one cat. WIRED emptied the Litter-Robot 5 about every 10 days with two cats, PETKIT's bag listing suggests changing bags twice a week for two cats, and WIRED's ELS PET Orbitie bin filled about every other day with two.

### Is a self-cleaning litter box safe if one of my cats is a kitten?
Only if every cat that uses it is above the maker's minimum weight and age. If a kitten under the minimum shares the box, run it with automatic cleaning off, use schedules, or give the kitten a separate manual box until it's big enough.

## Sources

- [Whisker: Litter-Robot 4](https://www.litter-robot.com/litter-robot-4.html) · checked 2026-11-12 — Up to four cats from 3 to 25 lb; drawer may need emptying as rarely as once every 8 days.
- [Whisker: Litter-Robot 5](https://www.litter-robot.com/litter-robot-5.html) · checked 2026-11-12 — Up to five cats from 3 to 30 lb; multiple lasers plus weight sensors; WasteID.
- [Whisker: Litter-Robot EVO](https://www.litter-robot.com/litter-robot-evo.html) · checked 2026-11-12 — Up to two cats from 3 to 19 lb; relies on weight sensors.
- [WIRED: The Best Automatic Litter Boxes](https://www.wired.com/gallery/best-automatic-cat-litter-boxes/) · checked 2026-11-12 — Litter-Robot 5 held about 10 days of waste from two cats; ELS PET Orbitie bin full about every other day with two cats; automatic models mean less need for multiple options, but keep the old box out.
- [Tom's Guide: I asked cats to test these robotic litter boxes](https://www.tomsguide.com/home/smart-home/my-cats-have-tested-these-robotic-litter-boxes-for-months-heres-the-one-they-use-the-most) · checked 2026-11-12 — The Litter-Robot 4 app tells cats apart by weight and can still cycle when the app says the bin is full.
- [PETKIT: Purobot Max Pro 2](https://www.petkit.com/products/purobot-max-pro-2-automatic-cat-litter-box-with-ai-camera) · checked 2026-11-12 — 8 L bin up to 17 days for one cat; recognizes up to 15 cats; 12 safety sensors.
- [AAFP/ISFM house-soiling client guide](https://catvets.com/wp-content/uploads/2024/01/HouseSoiling-B&W.pdf) · checked 2026-11-12 — One litter box for each cat, plus one extra box in multiple locations; cats may see adjacent boxes as one.
- [MSD Veterinary Manual: Providing a Litter Box for a Cat](https://www.msdvetmanual.com/cat-owners/selecting-and-providing-a-home-for-a-cat/providing-a-litter-box-for-a-cat) · checked 2026-11-12 — At least one more litter box than the number of cats, and a box on each floor of a multi-floor home.
- [Chewy: PetSafe ScoopFree Crystal Smart](https://www.chewy.com/petsafe-smart-wifi-enabled-covered/dp/261382) · checked 2026-11-12 — Designed for one or two cats; a tray lasts 20–30 days with one cat and 10–15 days with two.

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Our #1 pick
 Best for three or four cats: rated for up to four cats, app tells cats apart by weight, about $699–749 ![Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/_astro/whisker-litter-robot-4.CZhanV3w_VBSjy.webp)

### [Whisker Litter-Robot 4](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/)
 8.7

- Rotating globe
- 3–25 lb
- Up to 4 cats
- Entry stays open
Multi-cat homes (up to four cats) and big cats that want the best-supported, most-copied design on the market.
   $$$$ Premium Price tier: Premium typical street price; check Amazon for today's
[Check price on Amazon](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20)[Read the full review](https://selfcleaninglitterboxguide.com/litter-boxes/whisker-litter-robot-4/)

[🐾 Safe for your cat? Check weight limits, kitten rules and cats per box in 20 seconds.](https://selfcleaninglitterboxguide.com/tools/cat-safety-checker/)[💵 What will it really cost? Liners, trays and litter over five years, model by model.](https://selfcleaninglitterboxguide.com/tools/litter-box-cost-calculator/)

## Keep reading
[Planning
### How Many Litter Boxes Per Cat? The n+1 Rule, With or Without an Automatic Box
How many litter boxes do you need? The vet n+1 rule, one per floor, spacing and size, how automatic boxes count, and worked examples for homes with 1 to 4 cats.
 Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/how-many-litter-boxes-per-cat/)[Top picks
### The 8 Best Self-Cleaning Litter Boxes of 2026, Ranked for Safety and Value
The best self-cleaning litter boxes of 2026, ranked: Litter-Robot 4, PETKIT PuraMax 2, Purobot Max Pro 2, Neakasa M1 and more, with safety and cost notes.
 Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/best-self-cleaning-litter-boxes-2026/)[Which to buy
### Litter-Robot 5 vs Litter-Robot 4 vs EVO: Which Litter-Robot to Buy in 2026
Litter-Robot 5 vs 4 vs EVO: weight and cat limits, entry sizes, sensors, WasteID and Whisker+, prices and running costs, and which Litter-Robot fits your home.
 Updated Nov 12, 2026](https://selfcleaninglitterboxguide.com/posts/litter-robot-5-vs-litter-robot-4-vs-evo/)

 Best for three or four cats: rated for up to four cats, app tells cats apart by weight, about $699–749 Litter-Robot 4 $$$$ Premium Price tier: Premium
[Check price](https://www.amazon.com/dp/B0BH6MD3DJ?tag=selfcleaninglitterboxguide.com-20)