I work at Pet Supplies Plus. I have been feeding them Blue Buffalo for a few years now. I USED to feed them IAMS. But I spent two hours one day at the store reading labels. WHAT A DIFFERENCE!!!!

It's $32.99 for a large bag. But...they don't eat as much and their coats are soft and shiny. I'll never go back to (what we call at the store) grocery store food, which is garbage. And...I've never had issues with crystals in the urine. I do feed them canned food in the morning only. 4 cans split between 8 cats.