Right now our 11 year old Siamese/Himi eats Science diet prescription c/d. This is for both types of crystals, or preventing them. I picked up Innova at the local feed store with only good, real foods, as ingredients, this is shocking, I never realized that this was something available. So my question here is do you have a cat with the crystals (because prescription brand Science is for both types of crystals) and do you only feed them vet food with fillers and corn? I realize there are a lot of intelligent folks here that may enlighten me to keep the route I'm going, or try a change. Thank you in advance!