I thought Citrus was not good for dogs with crystals and stones
Maybe look into Azodyl - folks on the liver group give this daily (1/4 to 1/3 of a capsule daily), quite a few have had great success in treating the crystals.
I actually have it for Roxy, cause I am not sure if she has a "marking" problem or a bladder problem.
Anyway, Azodyl is like a probiotic. Maybe look it up and discuss with your Vet
