Quote:
Originally Posted by jennyranson 
We live in a very hard water area and my vet advised me to do two things - feed him a urinary health kibble along with his wet food, and to only use a low calcium bottled water in the cat fountain.
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I'm surprised the vet gave that recommendation, as even the hardest water is a very poor source of calcium compared to dietary intake and kitties don't drink a all THAT much. Water is considered "hard" for example if it has 100mg of calcium per liter, so about 20mg in a whole glass (which I believe is more than a cat drinks in a day), compared to say the 280mg of calcium in a 5.5oz can of Evolve chicken can food (which a cat can usually eat about two cans a day of so probably 10mg from water and 560mg from the food).
Also, if you have filtered water on say your fridge for example, those usually cut down the mineral content about in half. If you did still want mineral free water, you can save yourself a lot compared to bottled (which half the time is just some county's municipal water anyway) and get a RO filter. Saves money and better for the environment, buuuut that's all kind of moot IMO.
I would get a second opinion about the treatment of calcium *?* stones being reduced calcium intake, as that is different than what I've read is usually prescribed. If the stones are calcium oxalate, then its dietary oxalate intake that if anything is typically reduced for example. In fact, low levels of dietary calcium intake can alter the calcium-oxalate balance and increase the risk for stones. The latest research indicates its really all about the urine PH. Too acidic and you get calcium oxalate; and too alkaline and you get calcium phosphate. Well, and better hydration and lots of clean litterboxes so the kitty doesn't hold it of course as the urine is less concentrated.