I have learned that many times when a cat's urethra blocks it is NOT caused by crystal/stones, but by mucous. (whether the proper term is mucous PLUG or not, it is still an approriate desciption.)
After being flushed out of the urethra, back into the bladder the hopes are that it will dissolve and pass normally. Then it is realistically possible to re-block the cat if it does NOT dissolve to a small enough size.
Possibly the PU surgery might be needed. Rutherford needed this surgery as well as KAK' kitty. Since Rutherford's was caused by a stone, he was placed on a special diet to reduce his risk of forming new stones. So the best thing to find out is what can be done to minimize the formation of this type of mucous plug.
Best of luck with kitty.
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