LITTER STAR is non-toxic, hence is completely safe even if ingested by a cat. Very quickly eliminates liquid and solid waste odors. Continues to work for up to one month. Easy maintenance and clean-up. Nontoxic formula safe for cat and environment. Lasts longer than traditional cat litters. No messy clumps or litter dust. Superior absorbency. Specially formulated. Light weight for easy pouring. Usage guidelines this bag is one months supply for an average cat. Make sure the litter box is clean and empty. Fill the box with 1 to 2 inches of LITTER STAR. However, if using this product for larger or multiple cats, change the litter more frequently. To get your cat acquainted with this new litter, you may want to mix some LITTER STAR with a small portion of your previous brand cat litter. To prolong effectiveness of LITTER STAR, remember to remove solid waste on a regular basis. Please seal and store any unused portion in a moisture-free environment.