Purina Pro Plan Veterinary Diets UR Urinary St/Ox Feline Formulas are made with high-quality ingredients and are specially formulated to promote a urinary environment unfavorable to the development of both struvite uroliths and calcium oxalate uroliths. "Promotes a urinary environment unfavorable to the development of both struvite uroliths (undersaturated, RSS<1) and calcium oxalate uroliths (metastable RSS<12)" Helps dissolve struvite uroliths Helps reduce the risk of both struvite and calcium oxalate urolith recurrence Average urine pH range of 6.0-6.4 UR St/Ox canned loaf and Savory Selects diets contain > 75% moisture to contribute to total water intake High protein content to help maintain ideal body condition and lean body mass Great taste to help ensure adequate nutrient intake