Hi. I have a male cat who after a Perineal Urethrostomy was prescribed a diet of firstly Hills Science s/d and now c/d. He is doing well and there seems to be no new crystal formation. However he still seems to get idopathic cystitis. I have metacam and cystaid to treat him with at home, and sometimes the vet prescribes Synulox. What I really want to know is there anything else I can do to help him, is there a better food I could try that would stop this recurring problem, which drives the poor little chap bonkers.