Lexie does have crystals, so we have to put her on the Science Diet to dissolve them, she is allowed nothing else, that is gonna be hard with four kitties pinching each other's food,not to mention the cost has more than doubled for her food, but she is worth every bit of it, but it is worrying with three other mouths to feed,but we will manage, just have to think positively eh? at least it is not stress related according to the vet, they are the struvite cyrstals, sorry not sure on the spelling.