The pH control: Control + is a 100% natural cat litter that allows you to monitor your cats health. Its granules change color, showing an alteration in the pH of the urine. By identifying the symptoms in time, you can consult the veterinarian before the pathology manifests itself in a more serious way. A latest generation cat litter: Control + is a latest generation clumping cat litter. Its formula allows it to have a longer life than normal litters and to be a valid diagnostic tool in checking the health of your cat. Control + is a bentonite-based litter, a natural clay without added fragrances, in full respect of your cats physical well-being.