Yes, I think that using organic nutrients in hydro is definitely one of the main reasons people get root rot, due to deficiency. If the right ions are not available in the water, the plant will simply die and then rot.
I'm going to assume that a lot of people mistakenly use urea based sources of N in DWC thinking it's all the same thing, but that almost guarantees a calcium deficiency as the majority of N should be coming from calcium nitrate.
The only time I get root rot is after I've harvested and have been too lazy to clean the roots out. That will cause them to rot. My main point was that unhealthy roots and rotting roots are basically the same thing.
