I have been trying DWC and waterfarm type styles for the last 2 years with nothing but failure, just root rot problems every time. It doesn't matter how much scrubbing/bleaching I do, I tried a bunch of crap I can't keep the water temps down and ph stable. I have tried a few things and no matter how good everything starts by harvest time the buds are skinny and the roots are rotted. I tried without the screen so I had access to moving the plants to monitor the roots. That just made it so I could fight the rot when it showed up but I could never get rid of it. So I decided to go back to what I know, a peat/perlite mix. The growth is slower, so longer veg but at least the buds will finish instead of staying skinny and I need a real harvest. Oh this only seems to be a problem for me with cannabis, my pepper plants couldn't be happier in DWC and they were in the same tent/environment for months.