I've done a lot of research on cat foods and their ingredients because of cats with FLUTD. Blue Spa refused to tell me the pH of their canned cat food. Secretiveness is a big warning sign that there is something they need to hide. So, if your cat is male, I'd stay away from Blue Spa foods, as it is apparently too high (causing struvite crystals) or too low (which can cause calcium oxolate crystals).
So, my advice is to STAY AWAY!