The pidan Tofu Cat Litter with Occult Blood Test is a high-quality cat litter that is perfect for any cat owner who wants to keep their cat healthy and clean. This cat litter features a trace blood test that is designed to detect hemoglobin at a low concentration of even 0.1%. The color changing will last for 48 hours, and the litter is easy to flush and clean. It also has a sponge-like water absorption performance that makes it ideal for keeping your cat’s litter box fresh and clean.