Zoe C,
Thought you might find this interesting.
PetMD website, article written by Dr. Ken Tudor
““The solution to pollution is dilution” is the phrase we veterinarians now use to explain how to prevent urinary crystal and stone formation. Time, observation, and studies have shown us that there are no magical diets for solving this problem and that water consumption is key.
The more dilute urine is the less likely minerals can clump together to form crystals and stones, no matter what the urine pH.
Without any recipe manipulations, we have been successful in dissolving kidney and bladder struvite stones and preventing the recurrence of both struvite and oxalate crystals. I attribute the success primarily to the water content of the homemade diets for struvites and the combination of water and ingredient selection for oxalates.
The take home for those of you with cats and dogs that are urine crystal formers is to increase the amount of water in the diet.
That can be achieved easily by adding water to their dry and wet foods.” http://www.petmd.com/blogs/thedailyvet/ken-tudor/2015/november/water-solution-urinary-crystals-pets-33270
