Happy Cat VET Diet Struvit is used to break up struvite stones. The main features of this diet are the particularly high-grade protein along with reduced magnesium and phosphorus contents. It results in a clear reduction in urine pH levels. The slightly elevated sodium content increases water consumption and thus flushing of the urinary tract. The birch leaves and stinging nettle ingredients contained in the Natural Life Concept® are traditionally used to supplement conventional urinary tract treatments.