Fresh Step Crystals Health Monitoring Cat Litter, Color-Changing Litter Helps Detect Irregularities in Cat Urine, Controls Odor for 30 Days, 7 lb. BagLIGHTWEIGHT CAT LITTER: One 7 lb bag of Fresh Step Crystals Health Monitoring Cat Litter, which changes colors to help monitor your cats urine pH to better understand your cats health DETECT POTENTIAL ILLNESS EARLY: This pH activated cat litter crystals changes color instantly to detect irregularities in your cats urine, which could indicate health issues like UTIs and acidosis ORANGE COLOR (LOW pH): Acidic urine could be a sign of certain types of