I had the same problem.

First, I used NOW product for UTI's for pets. I used 1/4 pill dissolved in filtered hot water and added to wet food.

[link to www.nowfoods.com (secure)]

Second, I took away all dry food. I would serve my cat about several times a week, canned in water tuna. I would add additional water and the dissolved UTI pill.

Also fed my cat paté grain free foods stirred in ample water.

Third, cleaned floors even tiled floors. And put down Nature's miracle and let dry. And put new styled kitty litter boxes out.

Fourth, this is very important. These are my new styled kitty litter boxes. I put cut down boxes with no more than one cup of kitty litter. My cat used these boxes with about two inch sides. My cat must have disliked the deep kitty litter in boxes. My cat must have disliked the plastic liner I used in the deep kitty litter boxes as well. I have these boxes in my laundry room, two bathrooms and on patio. After one or two urine uses, just throw the box away. The cat uses these boxes.

Fifth, we have a porcelain multi tiered drinking fountain that is filled with filtered refrigerator water. My animals do not like the reverse osmosis filtered water. It hold nearly a gallon of water. The plastic ones smell. Yes, these are pricey but I have had mine 5 years. The cat drinks from it, I happy about that. [link to www.chewy.com (secure)]

UTI in cats have to do with the PH of their urine, too much dry food & not enough water. Their urine needs to be slightly acidic. Adding about 1/4 teaspoon of baking soda to their drinking water will help as well.