Litter-Robot Liners, Filters and Trays: Running Costs by Model

Litter-Robot waste drawer liners cost $12 for 10, $25 for 25 or $35 for 50 at Whisker’s U.S. store as of 2026-11-02. That works out to $0.70–$1.20 per liner. Whisker doesn’t say how many you’ll use in a month, because you replace a liner each time you empty the drawer. Below are the supplies for every model in our comparison table, with the pack price, pack size and the date we checked. We give a monthly cost only where the maker states how long an item lasts.

All prices are regular prices on each brand’s U.S. store, checked 2026-11-02.

Whisker: Litter-Robot 4, 5 and EVO

Waste drawer liners

Whisker says the liners “fit any Litter-Robot model.”

Whisker says to “replace the Waste Drawer Liner whenever you need to empty the waste drawer,” and that how often you empty it “depends on the number and size of your cats.” The emptying claims are:

• Litter-Robot 4: “as low as once every 8 days.”
• Litter-Robot 5: “up to 10 days” in a one-cat household.
• Litter-Robot EVO: “up to 7 days” for one cat.

None of these is a monthly liner count, so a monthly liner cost isn’t published. Multiply the per-liner price by how often you empty the drawer.

Carbon filters

The carbon filters work with the Litter-Robot 4, Litter-Robot 5/Pro and EVO. Whisker says they’re “not compatible with Litter-Robot 3/Connect.”

The filter page says “replace carbon filter every month (recommended)” and “1 filter = 1 cat.” The monthly figures above follow that guidance. The Litter-Robot 4 page gives a different interval: it says Whisker recommends replacing the filter and OdorTrap packs “every 2-4 weeks,” and that frequency “is up to you.” At two weeks, the cost would be double. Both pages say usage patterns matter.

OdorTrap packs (optional)

Whisker says to “replace pack every two weeks” and “3-pack = 1 cat.” The 3-pack works out to about $10 every four weeks. The packs aren’t required for the robot to run.

Whisker also shows Autoship prices, for example $8.40 for the 10-bag liner pack. We list the regular prices because Autoship terms can change.

Neakasa M1 Plus and M1 Lite Plus

Neakasa says you usually need to empty the waste container “about 14 days for one cat.” The bag page doesn’t say whether you use one bag per emptying, so a monthly bag cost isn’t published. The bag page also doesn’t list compatible models. We’ve matched it to the M1 Lite Plus by name only, so check with Neakasa before ordering for the Lite Plus. For the boxes themselves, see the Neakasa M1 page.

PETKIT Purobot Max 3

• Trash bags: PETKIT lists them for the “PUROBOT MAX 3, PURAMAX/2, PURAX.” The Max 3 page claims “up to 15 days” per bin “in a single-cat home,” but PETKIT doesn’t publish a monthly bag count, so a monthly bag cost isn’t published.
• N50: PETKIT says “each odor eliminator lasts up to one month.” That means it costs at least $6.66 a month, and more if you replace it sooner.

PetSafe ScoopFree Crystal Smart

The Crystal Smart is “designed for use with crystal litter only,” so the trays replace bagged litter. PetSafe says each tray “lasts up to 30 days” and to “change out the disposable tray just once a month.” That makes about $24.50 a month at the full stated life. With more cats, PetSafe says “your mileage may vary,” so trays may run out sooner.

PetSafe ScoopFree SmartSpin

We found no separate product page for SmartSpin liners or deodorizers, so no standalone supply price is published.

The SmartSpin bundle (item ZAL00-18094) was $379.99, which was less than the $399.99 box alone. It includes:

• “2 Packs Waste Bin Liners (50 liners total)”
• “4 Essential oil deodorizers (2-Month Supply)”
• a mat

A second bundle variant was listed at $449.99. PetSafe says the 6-liter drawer “holds up to 2 weeks of clumps and waste.”

Using these numbers

• Add your litter. These supplies come on top of litter for every model except the Crystal Smart. See litter for the Litter-Robot and litter for self-cleaning boxes.
• Total it up. Enter your monthly supply estimate in the cost calculator to see the total over one to three years.

Bottom line

The predictable recurring costs are the ones makers attach a time to:

• Whisker carbon filters: $5–$6 a month per cat.
• PETKIT N50: at least $6.66 a month.
• PetSafe crystal trays: about $24.50 a month.

Liners and bags are cheap per piece, from about $0.30 to $1.20. Their monthly cost depends on how often you empty the drawer, which no maker publishes as a monthly figure.