tuxluvr, no wonder if you didn't get all the info the vet told you, it can be confusing when you're in the middle of it and your cat is having a hard time. Not to mention the transport!

Hills S/D is supposed to dissolve the struvit stones and Hills C/D is supposed to prevent them. I thought of giving Fister bottled water also - as the vet said, it can't hurt! Another theory is that cats can develop UTI if they get stressed, or from lack of exersise. Could that be the case for Ritzy?

I hope Ritzy is getting better and continues to use the sand box!

Keep us posted, please. Best of luck!!