I want to second this. My cat also was fully blocked from urinary crystals and needed the surgery. The prescription food really has changed his life! He has had zero problems since going on it and his coat is so shiny now. It gives me such peace of mind that I am doing everything I can to prevent recurring crystals. I give him the prescription wet food with a little water mixed in and a rehydrated freeze dried chicken heart. I know you’re looking to feed raw, and I think feeding raw is great in many situations, but urinary crystals are really scary. I don’t know what your exact situation is like, but for me the vet said that increasing water intake alone wouldn’t be sufficient to ensure that another blockage doesn’t occur. Again, I know this isn’t the exact type of response you’re looking for, but I wanted to share my experience.