Has anyone ever done this? I used to. I stopped when my cat's vet told me she had never heard about what I told her. It was interesting how after I stopped doing that, my cat developed his first UTI. This was one of the reasons I had started it in the first place....to prevent UTIs. I got my information from a book I have called The New Natural Cat: A Complete Guide for Finicky Owners by Anitra Frazier with Norma Eckroate. Anitra Frazier is a nationally known feline nutritionist, groomer, & behaviorist. If anyone out there is interested in reading more about this, send me a PM with your email address and I will scan the pertinent sections of the book and send them your way. I will have to scan this at work tomorrow and my personal computer is down at the moment getting some work done on it. I'm using my mother's computer.