I am glad to hear both kitties came through well, and behaved wonderfully.

There is a thread in Cat Health that talks about non-grain foods preventing struvite crystals - it keeps the urine at a certain pH.

My boys have been on no-grain cat food for several weeks now...they don't eat as much of it, Oscar in particular is getting nice and lean and has more energy.

The no-grain food is high in protein, so maybe it's not good for Ash, but it might be good for Lexie. Check with your vet.

Hugs to Ash and Lexie!