Idiopathic cystitis Thanks to the high moisture content of wet food, Urinary S/O Felin increases urine dilution. Nearly 64 % of cases of Flutd are idiopathic cystitis and wet diet is recommended in cases of recurrent cystitis. Struvite dissolution Urinary S/O Feline effectively dissolves struvite uroliths. Low RSS Undersaturated urine creates a urinary environment unfavourable to the development and proliferation of struvite and calcium oxalate crystals. Urine Dilution Diluting urine decreases the urinary concentration of struvites and calcium oxalates. The larger urinary volume also helps ensure more frequent bladder emptying.