I have noticed candida threads mainly when I use enemas. After the enema cleans me out and I use more of the solution what I release will be the liquid from the enema along with tons of threads. (coffee or ACV enemas do the best with getting candida out for me) I had a massive clump of white threads come out that way one time and knew it couldn't be from my food, as there was NO "bm" with it if you know what I mean. I also get alot of smaller threads out as well with both coffee enemas and ACV enemas.
I've actually never noticed them in my regular bowel movements.