If it is hard, I would say, yes some sort of salt build up.
More pics will be helpful.


Really hard to get a good picture of....
I cannot find any other pics on the internet that look like this stuff.
It was on the hydroton in much larger amounts until I cleaned it off a couple days ago. I didn't notice it on the roots until today.
The stuff is soft, slimy and fuzzy looking, so I am leaning toward a fungus...
I am already using beneficial bacteria, and it's not working, so maybe a flush or some h202? I have never used h202 before... My temps and humidity inside the grow room seem good, Humidity is under 40% (which for flowering I think is OK), and temps go between 78-84max F
The only thing I did that I feel questionable about is having a river running over the rockwool... I didn't have a drip ring to recirc so I just let the water flow into the net pot... like 180 gallons per hour river...
I think it's possible that this was fucking up the PH... not sure...
I welcome any ideas!
Grey Bear, thanks again for stopping by and checking it out. If you weren't around to look at my grow once in a while I would be fucked!!!! Truly appreciated!