Neutralizes ammonia on contact with urine. Absorbs up to 140% of its weight in liquid and will do so repeatedly. Has less than 1% free crystaline silica (non-carcenagenic). Coverage of up to 1,000 sq. ft (5-6 times greater than competitive products. Ingredients: Diatomaceous Earth & Montmorillonite Clay (Volcanic Ash). 40#.