ROKEY Fresh n Purr FP411CR Cat Litter Deodorizer Pack Fresh n Purr Cat Litter Deodorizer Crystals and Mist work together to absorb tough litter box odors Safe for cats non toxic and non staining Ultra concentrated, the 2.5-ounce bag lasts for up to 90 days approximately 20 litter box changes Pleasant green apple scent Fresh n Purr Cat Litter deodorizer Mist has natural oils which are effective and long lasting