World‚Äôs Best Cat Litter aaages Made in America from eco-friendly, whole kernel corn. Unscented, biodegradable and contains no harmful chemicals. World's Best Multiple Cat litter is designed for households with more than one cat. It clumps more quickly, so moisture doesn't spread throughout your cat's litter tray. World‚Äôs Best Litter is safe to flush down the loo ‚Äì even if you‚Äôve got a septic tank. 99% dust free. Really long lasting ‚Äì this huge 6.35kg bag lasts for around 33 days if you have two cats, 22 days if you have three cats, and 16 days if you have four cats (#goals!).