The Complete Guide to Cat Litter and Litter Trays

Understanding What Your Cat Needs from a Litter Tray

Cats are fastidious creatures with strong instincts around toileting. In the wild, they bury their waste to conceal their presence from predators and competitors. Domestic cats retain this instinct, and a litter tray that meets their behavioural needs will be used reliably. A tray that does not meet those needs — too small, too dirty, wrong litter texture, wrong location — may be rejected in favour of your carpet, your laundry, or other soft surfaces.

The essentials from a cat's perspective are: a substrate they can dig in comfortably, sufficient depth for burying, enough space to turn around and position themselves, cleanliness (cats will avoid a tray that is not scooped regularly), and a location that feels safe but accessible.

Clumping Clay Litter

Clumping clay litter, made from sodium bentonite, is the most widely used cat litter worldwide. When wet, the clay forms tight clumps that can be scooped out, leaving the remaining litter clean for continued use.

Advantages: Excellent clumping makes daily cleaning efficient. Good odour control when scooped regularly. Widely available and familiar texture that most cats accept readily. The scooping approach means you top up rather than replacing the entire tray contents frequently.

Disadvantages: Heavy to carry. Produces dust — some brands more than others — which can be a concern for cats with respiratory sensitivities and for humans with asthma. Not biodegradable. Produced by strip mining, which has environmental implications. If ingested (a risk primarily with kittens), clumping clay can cause intestinal blockages.

Clumping clay remains the benchmark against which other litters are measured. It works well for most cats and most households. The environmental and dust concerns are legitimate trade-offs that may or may not influence your choice.

Non-Clumping Clay Litter

Non-clumping clay absorbs liquid but does not form removable clumps. The entire tray contents need to be replaced more frequently — typically once or twice per week rather than simply scooping clumps daily.

It is less expensive per bag than clumping clay but may work out similarly in cost over time due to more frequent complete changes. Odour control is generally inferior because urine-saturated litter remains in the tray between changes.

Non-clumping clay has largely been replaced by clumping options in most markets, though it remains available and has a role for kittens (it is safer if accidentally ingested, as it does not expand like clumping clay).

Crystal (Silica Gel) Litter

Crystal litter is made from silica gel — the same material found in small packets labelled "do not eat" in shoe boxes and electronics packaging. The granules absorb moisture and lock odour-causing compounds inside their porous structure.

Advantages: Excellent long-term odour control — crystals can last two to four weeks for a single cat before needing a complete change. Low maintenance between changes — scoop solids daily and stir the crystals to distribute moisture evenly. Lighter than clay. Very low dust compared to many clay litters.

Disadvantages: Non-clumping — urine is absorbed into the crystals rather than forming removable clumps. The texture is harder and some cats dislike walking on it. Some cats find the crystals uncomfortable under their paws. Not biodegradable.

Crystal litter suits owners who want minimal daily maintenance and are happy with a periodic full change rather than daily scooping.

Wood-Based Litter

Wood litter comes in pellet, granule, or fibre form, typically made from pine, cedar, or recycled wood. Pine-based litters have natural antimicrobial properties and a pleasant woodsy scent.

Advantages: Biodegradable and compostable (for non-food garden use). Lighter than clay. Low dust in pellet form. Natural odour control from pine phenols.

Disadvantages: Pellet litters do not clump in the traditional sense — pellets absorb moisture and break down into sawdust, which is separated using a sifting tray. Some cats dislike the texture of pellets under their paws. The natural pine scent, while pleasant to many humans, can be off-putting to some cats who prefer unscented substrates.

Wood litter works well for environmentally conscious owners and cats who accept the pellet texture. It pairs well with sifting-style tray systems designed for pellet litters.

Tofu Litter

Tofu litter is made from soybean fibre — a byproduct of tofu production. It has emerged as one of the most popular natural alternatives to clay, and for good reason.

Advantages: Clumps well — often comparable to clumping clay in scoopability. Very low dust compared to clay. Significantly lighter than clay. Biodegradable and many brands are flushable (though always check local regulations before flushing cat waste). Non-toxic if accidentally ingested, making it safer for kittens. Naturally acidic, which helps neutralise ammonia from urine.

Disadvantages: More expensive per bag than clay. Some brands have a faint earthy or soy smell that some owners notice. Clumps may not be quite as firm as bentonite clay clumps. May not be compatible with all self-cleaning litter trays (check manufacturer guidance).

Tofu litter is an increasingly compelling option that balances performance, safety, and environmental responsibility. For households willing to pay a modest premium, it addresses many of clay's drawbacks.

Corn, Wheat, and Other Plant-Based Litters

Various plant-based litters are made from corn, wheat, walnut shells, and grass. Each has its own characteristics.

Corn-based litters clump reasonably well and are biodegradable. Some have a slightly sweet scent. A concern is that corn can attract insects if stored in warm conditions. Corn and wheat litters should be avoided if your cat has a grain allergy.

Walnut shell litters are dark in colour (which helps disguise soiled areas) and offer natural odour control. They are heavier than other plant litters.

Grass-based litters are lightweight, low-dust, and clump reasonably well. They are relatively new to the market and may not be available in all areas.

Paper-Based Litter

Paper litter, usually made from recycled newspaper processed into pellets or soft granules, is very gentle on paws and produces virtually no dust.

Best for: Cats recovering from surgery (where dust-free, soft litter prevents irritation of surgical sites), cats with respiratory sensitivities, and kittens.

Drawbacks: Generally non-clumping, which means more frequent complete changes. Odour control is modest compared to clay or crystal. Lightweight pellets can be tracked easily.

Choosing the Right Litter Tray

Size: The tray should be at least one and a half times the length of your cat from nose to tail base. Most commercial litter trays are too small for adult cats. Larger is almost always better — cats need room to enter, turn, dig, and position themselves comfortably.

Depth: The sides should be high enough to contain litter as the cat digs (approximately 12–15 cm / 5–6 inches), but with at least one low entry point for easy access, particularly for kittens, elderly cats, or cats with mobility issues.

Material: Smooth, non-porous plastic is standard and easy to clean. Stainless steel trays are emerging as a premium option — they do not absorb odours, do not scratch, and are more hygienic long-term.

Covered Versus Open Trays — The Honest Debate

This is one of the most debated topics in cat care, and the honest answer is: it depends on the cat.

Covered (hooded) trays contain odour and litter scatter, provide the cat with privacy, and look tidier in the home. Many owners prefer them.

The problem: Covered trays trap odour inside, which is unpleasant for the cat even if it is less noticeable to you. They restrict the cat's movement and sight lines, which can make anxious cats feel trapped — particularly if another cat (or a dog) blocks the single exit. Studies and feline behaviourists often recommend open trays as the default because they allow the cat to see their surroundings and escape in any direction.

The practical approach: Offer both if space allows — an open tray and a covered tray — and let the cat show you their preference. If you use covered trays, ensure they are cleaned more frequently than open ones (since the trapped odour is concentrated) and that multiple trays are available so the cat is never forced to use a covered tray they are uncomfortable with.

Self-Cleaning Litter Trays

Self-cleaning trays use sensors and mechanical rakes to detect when the cat has left the tray and automatically sift clumps into a sealed waste compartment. They reduce the frequency of manual scooping.

Advantages: Convenience — reduced daily scooping. The tray is always relatively clean for the next use. Odour is contained in a sealed compartment.

Disadvantages: Expensive compared to standard trays. Mechanical components can malfunction. The motor noise can startle some cats. Not all litter types are compatible (most require fine-grained clumping litter). The waste compartment still needs regular emptying and the entire unit needs periodic deep cleaning.

Self-cleaning trays suit owners who are away from home for extended periods and want consistent cleanliness. They are not zero-maintenance — they reduce maintenance, not eliminate it.

Litter Mats and Tracking Solutions

Litter mats are textured mats placed around the tray to capture litter granules carried on the cat's paws as they exit. They reduce the spread of litter across floors and make cleanup easier.

The best litter mats have a honeycomb or textured surface that traps granules effectively, are large enough to surround the tray exit area, and are easy to shake out or vacuum.

Choosing a litter with low tracking properties — larger pellets or granules are tracked less than fine-grained litters — also helps. Tofu and wood pellet litters generally track less than fine clumping clay.

Odour Control — What Actually Works

Regular scooping is the single most effective odour control measure. Scooping clumps at least once daily prevents the accumulation that causes noticeable smell. No amount of perfumed litter or odour-neutralising additives compensates for infrequent scooping.

Complete litter changes on a regular schedule (weekly for non-clumping, every two to four weeks for clumping, depending on the number of cats) prevent the gradual buildup of urine-saturated litter that no amount of daily scooping addresses.

Unscented litter is generally preferred by cats. Heavily scented litters mask odour for humans but can be overwhelming for cats, whose sense of smell is far more sensitive. Some cats will avoid strongly scented litter entirely.

Baking soda sprinkled in the litter is a safe, mild odour absorber that most cats tolerate. Purpose-made litter deodorisers are also available.

Ventilation around the tray helps dissipate odour. A tray in a closed cupboard concentrates smell; a tray in a ventilated area disperses it.

Multi-Cat Litter Tray Rules

The widely cited guideline is one litter tray per cat plus one extra. So two cats need three trays; three cats need four. This is not arbitrary — it reflects feline territorial behaviour.

Cats may refuse to share a litter tray with another cat, particularly if there is any tension between them. A cat that does not feel safe using the tray will find somewhere else to go. Multiple trays in different locations ensure every cat has access to a clean, unoccupied tray at all times.

Trays should be in different locations — three trays lined up next to each other count as one tray in the cat's mind. Spread them across different rooms or different areas of the home.

Tray Placement

Place trays in quiet, accessible locations away from high-traffic areas. Do not place them next to food or water bowls. Ensure the cat can access the tray at all times — a tray behind a closed door is useless.

Avoid placing trays next to noisy appliances (washing machines, tumble dryers) — the sudden noise can frighten a cat and create a negative association with the tray.

For multi-storey homes, provide at least one tray per floor.

How Deep Should the Litter Be?

Most cats prefer a litter depth of approximately 5–7 cm (2–3 inches). Too shallow and there is insufficient material for burying. Too deep and some cats find it unstable to walk on. Observe your cat — if they dig enthusiastically, they may prefer a slightly deeper layer.

Transitioning Between Litter Types

If you want to change litter types, do so gradually. Cats are creatures of habit, and a sudden, complete change in substrate may cause tray rejection.

Mix a small proportion of the new litter into the existing litter, increasing the ratio over one to two weeks until the transition is complete. This allows the cat to adjust to the new texture and scent gradually.

Litter for Kittens

Kittens explore with their mouths and may ingest litter. Avoid clumping clay litter for very young kittens — if swallowed, the clumping material can expand inside the digestive system and cause a blockage.

Non-clumping litter, paper-based litter, or tofu litter (which is non-toxic if ingested) are safer options for kittens. Transition to your preferred adult litter once the kitten is past the exploratory chewing phase, typically around four to five months of age.

Environmental Considerations

Clay litter is produced by strip mining and is not biodegradable. It is the most environmentally impactful option.

Crystal litter is also non-biodegradable and energy-intensive to produce.

Wood, tofu, corn, wheat, and paper litters are biodegradable and derived from renewable or recycled materials. Many can be composted (for non-food garden use only — cat waste may contain parasites that should not enter food-growing areas). Some tofu litters are flushable, though local regulations vary.

If environmental impact is a priority, plant-based litters offer a meaningful improvement without necessarily sacrificing performance. Tofu litter in particular delivers clumping performance close to clay with a fraction of the environmental footprint.

Comparing Litter Types at a Glance

Common Mistakes Owners Make

Not scooping daily. Daily scooping is the foundation of a clean, odour-free litter tray. No litter type compensates for infrequent scooping.

Choosing a tray that is too small. Cats need room. Bigger is better.

Having too few trays in a multi-cat household. One per cat plus one extra, in different locations.

Using heavily scented litter. Cats have sensitive noses. Unscented litter is generally preferred.

Placing trays in inconvenient locations. A tray in the basement that the cat has to cross the entire house to reach will be rejected in favour of somewhere closer.

Changing litter types abruptly. Transition gradually over one to two weeks.

Using clumping clay for young kittens. Non-toxic alternatives are safer.

Pre-Purchase Checklist

• [ ] What litter type suits my priorities (performance, environment, dust, weight)?
• [ ] Is the tray large enough for my cat (1.5 times body length)?
• [ ] In a multi-cat household, do I have one tray per cat plus one extra?
• [ ] Are the trays in different, quiet, accessible locations?
• [ ] If I have a kitten, is the litter non-toxic if ingested?
• [ ] Am I committed to daily scooping?
• [ ] Would a litter mat help control tracking?
• [ ] If considering a self-cleaning tray, is it compatible with my chosen litter?
• [ ] Have I chosen unscented litter (or a scent my cat accepts)?
• [ ] If switching litter types, do I have a transition plan?

Why Buying Through Amazon Makes Sense

Cat litter is heavy, bulky, and consumed continuously. Having it delivered to your door rather than carrying it from a shop is a genuine practical benefit. Subscribe-and-save options ensure you never run out, and the ability to compare litter types side by side — with reviews from thousands of cat owners describing dust levels, odour performance, and cat acceptance — makes informed purchasing significantly easier.

Amazon Marketplace Protections

Amazon purchases are covered by the A-to-Z Guarantee. In the UK, the Consumer Rights Act provides additional protection. In the US, equivalent protections apply.

Amazon Renewed self-cleaning litter trays may be available at reduced cost — a practical option for testing whether automated cleaning suits your household.

Related Guides

• The Complete Guide to Cat Bowls, Feeders and Water Fountains
• The Complete Guide to Kitten Essentials
• The Complete Guide to Cat Calming Products
• The Complete Guide to Pet-Proofing Your Home

The best litter tray is the one your cat uses reliably, every time, without you ever having to think about it — and that reliability starts with getting the details right.