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The litter aisle is designed to confuse you. Twelve brands, all shouting “99% dust free” and “odour lock technology”, and behind them a wall of 10kg sacks that all look like gravel. Most people grab whatever’s cheapest, get it home, and discover three days later that their cat hates it, it tracks across the hallway, or it smells like a chemistry lab.
I’ve scrubbed out enough litter trays to have opinions. Here’s what actually matters, in roughly the order it will affect your life.
Start With the Cat, Not the Packaging
Litter is a sensory product. Your cat walks on it four times a day, digs in it, and buries things in it. That’s a lot of contact, so the cat’s age and build come before brand loyalty.
Kittens under about four months
Kittens investigate with their mouths. A clumping clay that sets rock-hard in water can do the same inside a small digestive tract, which is why most vets steer new owners toward non-clumping clay, paper pellets or a fine wood litter until the kitten is older. It’s a temporary compromise, not a forever decision.
Senior cats and arthritic cats
A 14-year-old cat with stiff hips does not want to climb over a high-sided tray, and hard crystal litter can feel like walking on Lego. Fine, soft, deep litter in a low-entry box makes a genuine difference to whether she uses it at all.
Long-haired breeds
Persians, Maine Coons and anything with feathered trousers will carry fine sand-grade litter in their coat. Larger pellets and a good mat cut the mess considerably. If you’re still deciding on a breed, our guide to indoor cat breeds that thrive without a garden covers which types tend to be heaviest box users.
The Six Types Worth Knowing
Clumping clay (bentonite)
The default for good reason. It forms scoopable clumps, controls smell reasonably well, and most cats accept the texture. Downsides: it’s heavy, it tracks, and cheap versions produce a dust cloud every time you pour.
Non-clumping clay
Cheaper per bag, but you can’t scoop urine, so the whole tray needs emptying every four or five days. Fine for kittens and post-surgery cats, tedious long term.
Wood and paper pellets
Low dust, low tracking, and wood pellets break down into sawdust when wet. Odour control is average and clumping is nonexistent, but for a cat with respiratory issues or a household with allergies, they’re often the fix.
Tofu, corn, wheat and walnut litters
Plant-based clumping litters are lighter than clay, clump firmly and biodegrade. They’re pricier, and some cats react to wheat or corn. Be sceptical of “flushable” claims: plumbing in older flats disagrees.
Silica crystals
Excellent at absorbing urine and drying waste, so a bag lasts a long time. Some cats refuse the texture, and the crystals need stirring every day or the bottom layer turns into a swamp.
Paper pellets
The choice for cats recovering from surgery or with a wound. Poor odour control, no clumping, but soft and dust-free.
Dust Is the Factor People Underestimate
Pour a scoop of litter from waist height in decent light. If you can see a cloud, that’s what’s going into your cat’s airways every day, and into yours. Cats get feline asthma, and dusty litter is a common trigger for coughing fits that owners mistake for hairballs.
Low-dust doesn’t have to mean expensive. Wood pellets and good-quality plant litters are consistently cleaner than budget clay. If someone in the house has asthma, this is the one spec worth paying for.
Scented Litter Is for You, Not the Cat
Cats have around 200 million scent receptors. You have roughly five million. A lavender-scented litter that smells faintly pleasant to you is an overwhelming chemical fog to a cat standing in it. Scented litters are also a common cause of sudden tray avoidance in otherwise confident cats.
Buy unscented and fix odour at the source: scoop twice a day, keep two to three inches of depth, and wash the tray with unscented soap once a week. That works better than any baking-soda bead.
The Details You Notice at 6 a.m.
- Clump strength: scoop a wet clump after an hour. If it crumbles into the clean litter, you’ll be replacing the whole tray weekly.
- Tracking: fine sand-grade litter ends up in bed with you. A textured mat at the tray exit helps; so does a coarser grain.
- Weight: a 10kg clay bag carried up three flights gets old fast. Check whether the shop delivers before you commit to a heavy brand.
- Grain size: very fine litter is soft underfoot but dusty; very coarse pellets stay put but some cats find them uncomfortable.
- Bag resealability: a small thing until you’re storing an open sack in a damp cupboard.
Do the Cost Maths Properly
Price per bag is meaningless. What matters is cost per month for your cat.
A £9 bag of clumping clay might last five weeks for one cat, because you only remove clumps and top up. A £6 bag of non-clumping litter needs a full change twice a week, so you’ll go through three bags in the same period. The “cheap” option quietly costs more, plus considerably more labour.
Silica crystals look expensive at £15 but can stretch to six or seven weeks for a single cat. In a three-cat household, that maths collapses and clay wins.
Match the Litter to the Box and the Flat
Hooded trays trap dust and smell, and many cats dislike the enclosed feeling. An open tray at least one and a half times the length of your cat, in a quiet corner away from food, works better than any premium litter in a bad box.
Small flats change the equation. In a one-bedroom with thin walls, tracking and smell travel further, so low-tracking wood or plant litter plus a mat earns its keep. Our piece on cat breeds that cope with small flats covers the space side of that trade-off.
How to Switch Without a Protest
Never swap the litter and the tray on the same day. Mix the new litter in at about a quarter strength, then half, then three-quarters over ten days to two weeks. Leave a handful of the old litter in the fresh tray so it still smells familiar. If your cat starts peeing beside the box, slow down and go back a step.
What the Clumps Tell You
Litter is a diagnostic tool if you pay attention. Golf-ball-sized clumps, four or five a day for an adult cat, means normal. Lots of tiny clumps the size of grapes can signal straining or cystitis, and a cat that suddenly stops using the tray needs a vet, not a new brand.
Bigger, heavier clumps usually mean a well-hydrated cat, which is what you want. If the clumps have shrunk and stayed small, check that she’s actually drinking; these practical fixes to get a cat drinking more water are a good starting point before you assume a litter problem.
Multi-Cat Homes and First Timers
The rule of one tray per cat plus one exists for a reason. Two cats sharing a single tray will soil it faster than any litter can cope with, and you’ll blame the product for a capacity problem.
If this is your first cat, buy the smallest bag of two or three different litters rather than committing to a 10kg sack. Cats have strong preferences and they don’t read the reviews. Once you know what yours will actually use, stock up. Our guide to cat breeds for first-time owners is worth a read if you’re choosing a companion and want an easy-going box user alongside everything else.
