also, I battled some root rot in my first dwc. are you using anything besides the h2o2 like hydroguard? I use hydroguard right now but have battled some res temp issues as of late with the recent heat wave. I've been treating my roots each week when I change out my res and rinse them in a bucket of h2o2 water then rinse again in a clean water bucket before going back into my rdwc. seems to be working out ok so far...
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