That's what I thought. However if mt material growth is kinda funky right now on an organic set up (drip), then i want to kill that bad and start new with res change. I have 50 gallons and added 150ml of h2o2. I am looking to get rid of bad as the temp rose about 75 and the res started to smell in one day. Water change and res clean are the 25th... So...
I use 29% H2O2 from the hydro store - but pretty much just as a momentary treatment. Unfortunately, I have considerable experience with root rot and DWC/RDWC. H2O2 isn't nearly as effective as a chlorine based disinfectant like UR Roots. Peroxide will immediately react with dead/dying roots and pretty much within an hour it's already broken down. Chlorine based disinfectants will leave a residual free amount that will continue to disinfect. Even with CL, you'll need to keep adding it back every 2 days to maintain it's efficacy.
Beneficials are primarily for soil/coco environment. Most of these benefits come from the fungal networks that are formed which can't form in liquid - and so pretty much only bacteria grow - good AND bad. Beneficials CAN be used in DWC, but their liabilities are far more than their benefits. Not that it can't be done - but it makes everything that much more delicate and pathogen bloom is much more likely. UC Roots or Clear Rez - any of those Cl based disinfectants will be the most stable and more likely to actually prevent root rot.