Dr. Elsey's Ultra Litter Attractant is a feline behavior modification and training tool providing a guaranteed solution for problem cats that won't use their litter box. This product naturally attracts cats and kittens to use the litter box. Dr. Elsey's Ultra Litter Attractant is the only litter attractant to provide a clinically tested and consumer proven solution. Just 20 oz of this product (one pouch) will treat 100 lbs of medium size particle, non-scented clumping clay litter and last one cat over three months. To be used with Dr. Elsey's Ultra Litter.