Is Cats Safe?
Is Diatomaceous Earth (pool/filter-grade) Safe for Cats?
No — Diatomaceous Earth (pool/filter-grade) is toxic to cats.
Pool/filter-grade diatomaceous earth is heat-calcined to contain 60–70% crystalline silica, which is an IARC Group 1 carcinogen by inhalation and causes progressive, irreversible lung damage. It looks nearly identical to food-grade diatomaceous earth, so always check the label carefully. Do not use this product in the home where cats are present.
| Category | Household |
|---|---|
| Also known as | pool grade de, filter grade diatomaceous earth, calcined de |
Signs to watch for in cats
- Heat-calcined to 60–70% crystalline silica — an IARC Group 1 carcinogen by inhalation that causes progressive
- Irreversible lung damage. Looks almost identical to food-grade in the bag
- Check the label. Do not use in the home
If your cat may have been exposed to Diatomaceous Earth (pool/filter-grade):
- Don't wait for symptoms; don't induce vomiting unless a professional tells you to.
- Note what and how much, and take any packaging with you.
- Call your vet or a 24/7 line now — Pet Poison Helpline 855-764-7661 · ASPCA 888-426-4435.
Cat-safe alternatives
Browse all Household for cats · or check another item.
Frequently asked questions
Is Diatomaceous Earth (pool/filter-grade) toxic to cats?
Yes. Diatomaceous Earth (pool/filter-grade) is reported toxic to cats by IARC; industry data. Keep it away from your cat.
What are the symptoms if a cat is exposed to Diatomaceous Earth (pool/filter-grade)?
Reported signs include: Heat-calcined to 60–70% crystalline silica — an IARC Group 1 carcinogen by inhalation that causes progressive, Irreversible lung damage. Looks almost identical to food-grade in the bag, Check the label. Do not use in the home.
How much Diatomaceous Earth (pool/filter-grade) is dangerous to cats?
There is no established "safe" amount — sensitivity varies by cat, and small exposures can still cause signs. Treat any exposure as potentially serious rather than waiting to see how much was involved.
What should I do if my cat ate Diatomaceous Earth (pool/filter-grade)?
Contact your vet or a 24/7 animal poison line right away: Pet Poison Helpline (855-764-7661) or ASPCA Animal Poison Control (888-426-4435).