Is Delicate Care Skin or Stomach for Cats safe to give to cats that have a history of FLUTD?

Delicate Care Skin or Stomach for Cats is suitable for cats suffering from chronic struvite accumulation in their urethra and bladder.  
The  low magnesium content decreases the propensity for struvite crystals to form and the Ammonium Chloride acidifies the urine which dissolves any struvite crystals that might have formed in the urethra.
The combination is the safest way to reduce the risk of struvite-based feline lower urinary tract disease (FLUTD).