Canadian Brand. Intersand OdourLock Unscented ultra premium litter is produced from high-quality clay, 100% pure and natural, for maximum efficiency without compromise! This litter will block ammonia (OdourLock technology activates on contact with urine to neutralize odours), has no tracking, and is extra-hard clumping. This unscented litter is purr-fect for sensitive noses and is dust free and safe to use, ideal for owners of cat with asthma or dust allergies.