Oh and trying to get 35% H2O2 here is like trying to buy a nuclear bomb lol. I found a 5 gallon pail for sale in the classifieds for $125, unfortunately I don't use it lol.
Neither does this guy
“ROT” by Serious Fourside
http://www.growweedeasy.com/root-rot
Cannabis Root Rot – Slimy Brown Roots
The Problem - Your cannabis plant starts drooping, leaves start getting sick, and roots are brown, smelly and/or slimy. These are all symptoms of cannabis root rot.
Sound familiar - burnt edges or tips; yellow, bronze or brown spots or stripes; nutrient deficiencies; clawing and curled edges; other unusual leaf symptoms?
Roots need water, but if they are get too much
water without enough oxygen they are much more susceptible to root rot. This is often caused by too-hot conditions, overwatering, and/or
not enough bubbles dissolving oxygen into a DWC water reservoir. [plenty of air bubbles does not mean plenty of oxygen bubbles and root rot thrives in low oxygen conditions.]
The writer recommends treating the rot after the outbreak – “You will need to treat the plant's root directly and you will also need change the plant's environment so that root rot no longer has a good place to grow.” And of course cold water and plenty of chemicals.
The writers opinion of using hydrogen peroxide: “
Don't Use Hydrogen Peroxide (H2O2)! H2O2 is temperarily effective
at best when it comes to getting rid of root rot. It makes me so sad when people tell growers to use H2O2 (hydrogen peroxide) to kill root rot. Even the commercial grade stuff just doesn't work (and I've tried)!
All H2O2 does is cause bubbling near the dead brown roots (or any organic matter), which is why I think people believe it's helping. In my experience it doesn't help the plants themselves (they don't look any better), and what's worse, all the H2O2 will be completely gone from the water within 24 hours.
H2O2 kills most of the bacteria in the reservoir, including any good bacteria, and does absolutely nothing to address the underlying problem. Although H2O2 does kill bad bacteria, it leaves enough of it there to repopulate your reservoir. As common as the advice to use H2O2 for root rot is, I've never seen a case by a real grower who was actually able to get rid of root rot with H2O2. [YIKES!]
If you
cannot/will not prevent the fungal outbreaks, treating the disease is the
only option you have left if you’re going to be a RDWC/DWC pot grower. Personally I’m into preventing the root rot disease and keep the crop and microbial eco system healthy.