Proper Method for H202 Root Rot Treatment

Hi all,
My DWC (5gal bucket) temps rose too high a couple weeks back when my A/C blew, and it looks like I’m dealing with root rot based on slimy brown spots on some roots, while others are pearly white, plus my pH crashes down into the 4s about every 24 hours.

I’ve been doing research on using H202 to treat/cure root rot, and found some helpful dilution guides, but nothing I found spells out HOW the H202 should be applied.

Do I just mix up some nutes and drop in the H202 (at appropriate dilution) and go about my business? Or do I need to spray or drizzle the solution over the affected roots, and if so, how often? If I just add H202 to nute water, how often do I refresh the H202?

if it matters, I just flipped to flower about a week ago, indoor grow, temps (air and water) are well maintained other than the HVAC problem mentioned above, pH is good on all plants but the one with root rot.
Thanks!
 
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