The three main types of UK cat litter

Walk into any UK pet shop and you face the same wall of cat litter you have always faced. Before the comparison, a quick overview of what you are actually choosing between.

Clay litter is the most common type in the UK — sold in every supermarket and pet shop. Made from bentonite (clumping) or fuller's earth (non-clumping). Cheap and familiar, but strip-mined and non-biodegradable.

Silica crystal litter is made from silica gel beads. Highly absorbent, long-lasting, low-maintenance. More expensive, mined from quartz, also non-biodegradable.

Tofu litter is made from compressed food-grade soy husk — the natural byproduct of tofu production. Plant-based, biodegradable, virtually dust-free. Newer to the UK market but growing fast among cat owners who care about what their cats breathe.

For a deeper introduction to tofu cat litter, read our guide: What Is Tofu Cat Litter?

Dust levels

Clay litter — especially clumping bentonite — releases fine crystalline silica dust every time your cat covers. That dust can irritate the airways of cats and the people who live with them. Silica crystals produce less dust but fine grades can still be inhaled.

Tofu litter is virtually dust-free. No clouds when you pour, no haze when your cat digs.

If your cat sneezes after using the litter box, dust is a common culprit.

Verdict: Tofu, by a wide margin.

Odour control

Clay relies on absorption plus synthetic fragrance — masking odour rather than neutralising it. Many cats actively dislike the perfume, which can lead to litter box avoidance.

Silica traps moisture and slows bacterial growth — effective but not eternal.

Tofu controls odour through natural plant-based absorption — no synthetic fragrance, nothing to overwhelm a sensitive nose.

Verdict: Tofu, on cleanest method. Silica close on raw effectiveness.

Texture and paw comfort

Clay is granular and gritty. Silica is hard crystals — many cats find it uncomfortable, particularly kittens and senior cats. Tofu pellets are noticeably softer than both.

This matters most for kittens, senior cats with arthritis, and cats recovering from paw injuries. Some cats simply refuse silica because they find the crystals uncomfortable.

Verdict: Tofu.

Environmental impact

This is where the comparison becomes one-sided.

• Clay is strip-mined bentonite — non-renewable, environmentally destructive at source, takes centuries to break down in landfill.
• Silica is mined quartz sand — also non-renewable, manufactured into beads, landfilled forever.
• Tofu is made from a food production byproduct that would otherwise be wasted. It is a circular product, and it is biodegradable.

If environmental impact matters to you, there is no contest.

Verdict: Tofu, by a massive margin.

Disposal

All three go in your general waste bin. The difference is what they are made of: clay and silica are minerals that do not biodegrade, while tofu is made from plant-based, biodegradable ingredients.

Whichever litter you use, never flush cat waste — it can carry Toxoplasma into rivers and seas.

Verdict: Tofu — the only one of the three made from plant-based, biodegradable ingredients.

Cost per week

Honest answer: clay is the cheapest litter you can buy, and tofu costs more. Prices vary by brand and shop, so check the cost per week, not just the bag price.

• Clay: the lowest price per week. The trade-offs are dust, weight and landfill.
• Silica: a higher bag price, but each bag lasts longer.
• Tofu: a higher price per week than clay. A 5kg pack typically lasts one cat around four to six weeks — divide the price by the weeks to compare fairly.

Verdict: Clay. You pay more for tofu — for low dust, plant-based ingredients and a biodegradable product.

Cat acceptance

Most cats accept clay immediately — it is familiar. Some cats reject silica because of the hard crystal texture. Cats generally accept tofu well, especially kittens. Adult cats switching from clay may need a gradual seven-day transition.

Verdict: Clay short-term. Tofu catches up quickly with proper transition.

The verdict

Tofu wins five of the seven categories. Clay wins on price and on short-term familiarity — and familiarity is a transition problem that the seven-day method solves.

This is not about being trendy. It is about a category that has not been seriously rethought in decades finally being rethought.

How to switch your cat to tofu litter

The seven-day method works for most cats.

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

Kittens often adapt faster. Senior cats may need ten to fourteen days.

For full safety information — including for kittens, multi-pet households and pregnancy — read our companion guide: Is Tofu Cat Litter Safe?

What to look for when buying tofu litter

Not all tofu litter is the same. Look for these six things when buying any tofu cat litter:

• Three plant-based ingredients only — soy husk, corn starch, guar gum. Anything more is unnecessary.
• HACCP and ISO manufacturing certification — proves the production facility is held to food-grade safety and quality standards.
• Plastic-free packaging — FSC-certified outer with home-compostable inner bag (look for OK Compost HOME or TÜV Austria).
• No synthetic fragrance — natural odour neutralisation only.
• Full ingredient disclosure on the product page.
• A satisfaction guarantee — fussy cats happen, the brand should stand behind their product.