White is most likely yeast (except for flukes and one sort of intestinal worm which both are much bigger than candida). Candida comes in 3 forms:
1-the specs. small tiny piece with which it reproduces,
2-the young candida - in the toilet water it looks somehow as torn toilet paper (some people compare it to a snowy substance)
And 3-the candida threads - candida can aglomerate to one another and make a bigger entity. It builds up in long chain and then drills into the intestinal walls to reach for the bloodstream (causing leaky gut). So any thread-like white stuff is adult candida.