Yes, I know that what you say is correct; Frankie has the problem where the urine is too high pH and adding ascorbic acid is one thing that would lower pH. The vet originally recommended Methigel, but it didn't really work. Eventually, Frankie had the urethral bypass (his penis was removed) surgery, and tried to return to a regular diet (I only purchased high-end cat food from the pet-supply store), but he kept getting pink pee so his vet told me to only feed Hill's C/D from then on.
Jason, on the other hand, out of the blue, came down with these stones (Frankie had multiple episodes over the years which eventually led to the bypass surgery) which turned out to be oxalate (crystals that form when the pH is too low or too acid), so giving him ascorbic acid (Vitamin C) would not be good for the condition. I was concerned about feeding him C/D because the original formula was supposed to LOWER the pH (make more acidic) of the urine, but the vet tells me that now the food is formulated to neutralize from either end of the pH scale.
So far, all my cats like this food just fine and I feed them usually just the dry kibble with occasional feeding of the canned version. I have tried different feeding strategies, but at this point, my options are limited due to the fact that most of my cats stay indoors all the time and I can't segregate their food very easily (except temporarily), so I am at least thankful that there is one food everyone agrees on. The ones that go outside eat all kinds of crap that the neighbors and my grandparents put out, which is probably how Jason contracted the stones in the first place.
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"I have learned that pleasing everyone is impossible, but pissing everyone off is easy and fun as hell":eatu