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If your Litter-Robot is already working well with the litter your cat knows, there may be no reason to switch. Whisker says its sifting system needs clumping litter and recommends standard-weight clay as a reliable starting point. The two options below fit that brief, but neither is a magic fix for every cat or every home.
Quick comparison
| Litter | Worth considering if… | The trade-off |
|---|---|---|
| Catsan Ultra Plus, 3 x 5L | You want a familiar clay clumping litter with no added fragrance. | The Amazon pack is 15 litres, so it is a lot to commit to if your cat has not tried it. |
| Ever Clean Extra Strong Unscented, 10L | You want unscented clay litter and are putting odour control higher on the list. | It is a premium litter, and its box is still heavy to carry and pour. |
1. Catsan Ultra Plus, 3 x 5L: a sensible place to start
Catsan Ultra Plus is a clumping clay litter. Catsan describes it as finely granulated, low dust, and able to make small, stable clumps. That makes it a reasonable option to try if your cat is already comfortable with clay litter and you want to keep the change fairly straightforward.
There is one important catch: the Amazon listing we checked is a pack of three 5-litre bags. That is useful if you already know your cat accepts it, but it is a bigger first purchase than a single bag. We have not found a brand-specific Whisker approval for Catsan, so this recommendation is based on the general fit: it is clumping clay, rather than a claim that Catsan has been tested in every Litter-Robot model.
2. Ever Clean Extra Strong Unscented, 10L: for fragrance-free odour control
Ever Clean’s unscented clumping litter is the better fit if strong perfume is a concern. The manufacturer describes it as clay-based, low dust and fragrance-free, with activated carbon intended to trap odours rather than cover them with scent. The current Ever Clean UK site calls its unscented version “Extra Hygiene Unscented”; Amazon listings may still use the older “Extra Strong Unscented” name, so check the product details and pack before ordering.
This is not the pick I would make just to save money. It is worth considering when unscented litter and odour control matter more than buying the cheapest clay option. As with any litter change, introduce it gradually and watch whether your cat keeps using the tray comfortably.
What litter should you avoid in a Litter-Robot?
Do not assume that a litter will work just because it is sold for cats. Whisker says not to use strictly absorbent, non-clumping or loose-clumping litter, newspaper-based litter, or wood pellets in the Litter-Robot sifting system. Pellets do not break down into the clumps the machine is meant to separate.
Some plant-based litters can work, but performance depends on the exact product. Whisker notes that looser clumps can cause condensation in the waste drawer and may mean more frequent emptying and cleaning. If you want to use one, check the guidance for your exact Litter-Robot model rather than relying on a broad “automatic litter tray compatible” claim.
Before switching litter
- Keep the familiar litter if it works. Whisker advises continuing with your cat’s current litter when introducing a Litter-Robot, provided it clumps.
- Change gradually. A sudden change can put some cats off using the tray. Mix in the new litter over time and let your cat set the pace.
- Do not overfill. Add litter to just below the raised MAX line inside the globe. Excess litter can be wasted or affect a cycle.
- Check the model instructions. Litter-Robot 3 and 4 have their own guidance. For example, Whisker says white or translucent crystal litter may affect the Litter-Robot 4 drawer-full indicator.
So, which one should you buy?
If your current clay clumping litter works, stay with it. If you are switching, Catsan Ultra Plus is the simpler starting point of these two, as long as you are comfortable with the 3 x 5L pack. Choose Ever Clean if fragrance-free odour control is the reason you are looking to change and you are happy to pay more for that focus. Neither product is officially singled out by Whisker as the best litter for every Litter-Robot, so your cat’s comfort and the way the machine cycles matter more than the brand name.
FAQs
Does a Litter-Robot need a special brand of litter?
No. Whisker says the system needs clumping litter and recommends standard-weight clay. If your current litter clumps well and the machine works as expected, there is no need to change purely for the sake of buying a different brand.
Can you use wood pellets in a Litter-Robot?
Whisker says wood-based pellets are not suitable for its sifting system. Check the instructions for your exact model before trying any unusual litter type.
Can you use plant-based litter?
Some plant-based litters may work, but it depends on how well they clump and sift. Loose clumps may leave more mess or moisture in the waste drawer, so follow the model-specific guidance and keep an eye on how the unit is performing.
Where can I check the current price?
The two buttons above open the current Amazon listing for each litter. Check the pack size, price and delivery details there before ordering, as these can change.
For more on choosing litter around a particular concern, see our guide to cat litter for smell in the UK.
Last updated: 27 September 2026
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