Made with natural clay plus deodorizing system. 99.9% dust free. Powerful odor control. 24/7 Performance, continue odor control. America's no. 1 litter brand based on sales. Backed by 70 Years of Litter Expertise: Our history began when Ed Lowe invented litter in 1947, and reinventing litter has been our focus ever since. Combining our litter expertise with everything we learn from you, we're proud to keep growing our innovative portfolio of litter products. Stops ammonia odor for 14 days guaranteed when used as directed. Purina: Your pet, our passion. The Purina Promise: Pets are our passion. Safety is our promise. Progress is our pledge. 2/47 Performance: Slow-release deodorizing system ensures continuous odor control. Absorbency & clumping in every LightWeight Granule. Clumping power. Deodorizing system. Absorption power. Clean linen scent. Less weight, not less litter. Same uses as 20 lbs. 8.5 lbs Tidy Cats LightWeight = 20 lbs Leading Clumping Litter.