The cat litter most UK owners use without thinking

Walk into any UK supermarket and the cat litter aisle is almost entirely clay. Clumping bentonite, non-clumping fuller's earth, occasionally with "fresh fragrance" added. It is what your parents used. It is what you grew up with. It is cheap, familiar, and right there on the shelf.

This article is not designed to scare you. It sets out what clay litter is made of, what the concerns are, and what the evidence does and does not show — so you can decide for yourself.

Most UK cat owners have never been told what clay cat litter is made of. Here it is, plainly.

What clay cat litter actually is

Clay cat litter is made from one of two materials.

Bentonite clay is used in clumping litters. A type of absorbent clay strip-mined from open-pit mines, primarily in the United States, Greece, and Turkey. Bentonite swells dramatically when wet, which is what makes it clump.

Fuller's earth is used in non-clumping litters. Another absorbent clay, also strip-mined.

Strip-mining is a destructive form of mining. Topsoil is removed, vegetation is destroyed, the landscape is permanently altered. The clay is then transported across continents to processing facilities, then shipped again to retail markets. Heavy clay travels a long way — from mine, to factory, to shop, to landfill.

The crystalline silica problem

Here is what most cat owners do not know. Bentonite clay can contain small amounts of crystalline silica. When inhaled as fine dust, crystalline silica is classed by the International Agency for Research on Cancer (IARC) as a Group 1 carcinogen. That classification is based on long-term workplace exposure — mining, quarrying, construction — not on cat litter.

Household exposure from a litter box is far lower than workplace exposure, and it has not been well studied. What we do know: clay litter releases dust every time your cat digs and covers, and every time you pour or scoop. Less dust in the air is a sensible choice for you and your cat.

In workers with long-term, high-level exposure, crystalline silica dust is linked to silicosis and lung disease. A litter box is not a quarry — but there is no benefit to breathing the dust either.

If your cat has asthma or another airway condition, ask your vet about a low-dust litter. Many owners of sensitive cats make this switch first.

The ingestion risk

Cats groom themselves constantly. Some clay litter inevitably gets onto paws and fur and ends up swallowed during grooming. With clumping clay, this is worth knowing about.

Bentonite swells considerably when wet — that is how it clumps. In theory, a large amount swallowed could absorb moisture in the gut. Serious cases are rare and mostly anecdotal, but this is why clumping clay is often not recommended for young kittens.

This risk is highest for kittens, who groom more aggressively and have smaller digestive systems, and for cats with pica behaviour who deliberately eat litter.

The fragrance problem

Most clay litters mask odour with synthetic fragrance — "fresh linen," "spring meadow," "citrus burst." These are typically chemical mixtures designed for human noses, not feline ones.

Cats have a far stronger sense of smell than we do. What seems like a mild scent to you can be overwhelming to your cat — and a common result is a cat that avoids the litter box.

Scented litter also adds fragrance to the air of your home. If anyone in the household is sensitive to scents, unscented is the simpler choice.

The environmental cost

Clay is a mineral — it does not biodegrade. A cat on clay litter goes through a heavy bag every few weeks, for its whole life, and all of it ends up in landfill.

Multiply that by the millions of UK cat-owning households, year after year, and the scale of the landfill burden becomes clear.

Who benefits most from a low-dust litter

Not every home needs to worry. Switching makes the most sense for:

• Cats with asthma or chronic respiratory conditions — dust can aggravate symptoms
• Senior cats with weakened lung function — less able to cope with irritants
• Kittens under six months — and more likely to swallow litter while grooming
• Households with young children — less dust and scent near the litter box
• Family members with asthma or allergies — clay dust can trigger flare-ups
• Pregnant family members — the main litter-box risk is toxoplasmosis from cat faeces, so ideally someone else scoops; low dust and no fragrance make the job easier

What to use instead

The good news: alternatives exist, and they match or beat clay on most of the things that matter — though clay is still the cheapest.

Tofu cat litter is the alternative we rate highest — and yes, it is what we sell. Made from food-grade soy husk — a byproduct of tofu production — it is plant-based, biodegradable, virtually dust-free, soft on paws, and naturally controls odour without synthetic fragrance.

For a complete introduction, read our guide: What Is Tofu Cat Litter?

For a head-to-head comparison: Tofu vs Clay vs Silica

How to switch from clay safely

The biggest mistake people make is switching cold turkey. The seven-day method works for most cats.

• Days 1-2: 80% old litter, 20% tofu
• Days 3-4: 60% old litter, 40% tofu
• Days 5-6: 30% old litter, 70% tofu
• Day 7+: 100% tofu

Switch gradually over seven to ten days. Kittens often adapt faster. Senior cats may need ten to fourteen days.

The honest bottom line

Clay cat litter has been the default for decades. It is cheap. It is familiar. It is everywhere. But the case for it has never been weaker — and the case against it has never been clearer.

Dust in the air. Synthetic fragrance. Strip mining. Landfill with no end date.

The case for clay is cost and convenience. For a growing number of owners, low dust and a way out of landfill are worth paying a little more for.

BESTAMI tofu cat litter is one of those alternatives. Three plant-based ingredients. Made in a HACCP-certified, ISO-certified facility (certifications held by our manufacturer). Plastic-free packaging. Designed in the UK. Direct member of 1% for the Planet.

Try it with our 30-day promise: if your cat will not use it after a gradual switch, we refund you (minus £4.99 return postage). See Bestami Tofu Cat Litter →