Royal Canin Urinary S/O is a complete dietetic feed for cats. Its urine acidifying properties and its low level of magnesium make it suitable for dissolving struvite stones and reducing their recurrence. It is also formulated for the nutritional management of cats with lower urinary tract disease. Helps dissolve all types of struvite stones. Helps loewr the concentration of ions contributing to crystal formation. Urine dilution makes the urine less liable to form struvite and calcium stones. Reduced level of magnesium, a natural component of struvite crystals.