pidan Cat Litter Tofu Mix Contains the White Occult Blood Test Particles A Mix of Two Pellet Sizes for Enhanced Clumping and Ammonia Control, Made from Canadian Peas.

How It Works:

If a small amount of colorless blood is encountered, the test particles will turn blue. They can detect as low as 0.1% concentration of hemoglobin and continuously render color for 48 hours. If you notice a color change, it's recommended to seek medical attention for your cat.