Cat Food Change Help

I need a lil help understanding my cats food change.
Today she was at the Vets for another UTI secound in a year.
He saide there was blood in the urin and changec her food.
She is on Since Diet S/D for 30 Days then i am to change her
to C/D For life What is the difrence between thees two foods?
And should I not give her some tees at night like she likes?
So if somone out there can help me to inderstand thees two foods?
They Whys and how comes And the treat factor to.
Please do i am some what puzled on them.

Thank You
Peggy

First Welcome to TCS .. 2nd I hope a mod will move this to the health forum...

You need to talk with your vet...

S/d I believe dissolve s crystal s and the C/d is a maitence for UTi or crystal prone cats...

Thak You Very Much.
Peggy

May I ask what kitty was eating prior to the SD???

I wrote you asking for help you saide remove the and change
her box and litter.
I put the box in the room where she is most often and took out the spare room.
Clenend the box with lysol wipes and put difrent litter in.
And I be darn if it diden't work she peed or pooped one of the two.
I am so happy i am dancing around the house like A fool.
It worked like A mircle.
We will give A week or two then put it back where it was.

FROM THE BOTTOM OF MY HEART I FEEL SO GOOD
I CAN'T THAK YOU LADIES ENOUGH FOR THE INFO.
WHO WOULD HAVE THOUGHT THAT A SMALL CHANGE WOULD DO
WONDERS.
NOW I WILL GLADLY SCOPOP THE LITTER AFTER AT LEAST TWO DAYS IF NOT MORE SHE PEED YUPPIE YUIPPIE I THINK SHE WILL NOW GET BETTER.

THANK YOU THANK YOU SO SO VERY MUCH FOR YOUR HELP.
PEGGY AND THE QUEEN KALIEY KEE.

Since Diet For Sinures 7 years and up.
Peggy