Royal CaninFeline Urinary SO Dry Cat Food 

This veterinary-exclusive dry cat food was developed to nutritionally support an adult cat’s urinary tract and bladder health. It increases the amount of urine a cat produces to help dilute excess minerals that can cause crystals and stones. Relative Super Saturation (RSS) methodology is used to help lower ion concentration in urine, which contributes to stone formation. This formula promotes a urinary environment unfavorable to the formation of both struvite and calcium oxalate crystals. And this specialized nutrition, with a reduced level of magnesium, helps dissolve pure struvite stones and prevent struvite stones from forming. Lower urinary tract issues may be a recurring concern for some cats