My vet says that most formulas of food today contain stuff to prevent the forming of crystals. But only 20% of the cat UTI problems are due to crystals. More than 50% are idiopathic which means a lot of reasons (viruses, auto immune) that are not too well known today. Food does not help in these cases.

Only 3% are due to a primary bacteria infection. Of course any other cause can alos be followed by a secondary bacterial infection (and usually is).