Sprinkle evenly on top of litter. For one cat with a standard size litter box, we recommend using at least half a pack for a concentrated layer. Adjust accordingly per number of cats in the household or size of the box. Allow your cat to use the box as usual. When pellets come in direct contact with urine, they will turn from yellow to blue within 60 seconds if blood is detected. Color change will last for up to 48 hours. Check their litter box more frequently if you believe there is a health concern. If color changes occur, consult your veterinarian.

FOR PET USE ONLY. Keep out of reach of children. Inspect regularly and replace when litter becomes damp and/or soiled. A parasite found in cat feces may cause toxoplasmosis, especially in pregnant, nursing, or immunocompromised persons. Consult your physician for more information. Wash hands well after handling soiled litter. Dispose of litter in trash. Do not flush in toilets or dispose of in gutters or storm drains. Store in a cool, dry place.