Hey there...I'm so sorry..poor Dori! I read from about mid page three to now, and here are my thoughts.
One..it is totally unacceptable to discharge an animal drenched in urine...but this may be an issue with the staff responsible for care/preparing the animal for discharge versus the vet. I would tell the vet as this certainly reflects badly on them.
two - my vet sells a pump no-rinse shampoo..cleans and deoderizes, but no need to rinse it off, this is a godsend for pee and poo incidents.
three...the site I am going to list is graphic site, but I think a good one for you to look at for it's discussion of urine ph, calcium oxalate versus struvite crystals - treatment, food, difference in feeding (one is best with free feeding, one is not).
I went to the Royal Canin site re prescription diets and found this:
"Feline Lower Urinary Tract Disease â€“ Calcium oxalate urolithiasis URINARY SOâ„¢ (can, dry)
Feline Lower Urinary Tract Disease â€“ Idiopathic or Interstitial cystitis URINARY SOâ„¢ (can)
Feline Lower Urinary Tract Disease â€“ Struvite urolithiasis - prevention URINARY SOâ„¢ (can, dry)
DISSOLUTION FORMULA (dry)
CONTROL FORMULA (can, dry, pouch)"
If they are sure it is struvite, you would be on the dissolution formula..not a maintenance formula, imo. Can you check what the bag and the cans say? to see if they match any of the above? They don't list them as having a number in the name
Here is the site I'd like you to read over:http://lbah.com/feline/flutd.htm