I've done this and it works wonders. But, in my case, I've been also taking Miracle-Mineral-Supplement internally... for UTI's I found that I need two doses of 10 drops a day. I've observed no adverse effects whatsoever, except for complete relief of symptoms.
I believe thse bacteria hide in the crevices in the bladder, so bath maybe not enough, you can also douche with it, but still no guarantees it'll get to the bladder.
I'm a very chemichally sensitive person, I eat absolutely no junk food, I'm into macrobiotics, vegan, no gluten, etc... I use MMS on and off, as needed. But I'm also careful and I don't overdo it.