Freshn Purr Cat Litter Deodorizer crystals uses a laboratory proven odor absorption technology to significantly reduce the unpleasant odors associated with cat litter boxes. The process combines the absorption of ammonia and sulfur odors and releases a pleasant green apple fragrance. Works for up to 20 litter box changes! Great for multiple cat households. Freshn Purr Cat Litter Deodorizer Mist is non-toxic non staining and safe for all cats. Freshn Purr mist works with all cat litters to safely absorb unpleasant odors between litter changes. The natural oils associated with the mist are effective and long lasting! Features: Fresh n Purr Cat Litter Deodorizer 3 pack combo consists of 2 packages of Freshn Purr Cat Litter Deodorizer Crystals and one Freshn Purr Cat Litter Deodorizer 8 oz spray bottle mist.